I'm also a very skinny dude, and over the summer I got married and decided to start a work out routine and a serious diet. I started at 6" 125 lbs- yes you read correctly- but in 8 weeks I was 142lbs and gaining.
I'm getting over surgery(unrelated to my muscle/joints etc.) so I have unfortunately been out of training and lost a few pounds, but I'm starting up again and will be doing the same kind of routine.
I worked out off and on since highschool when I played sports and was never able to put on more than 5 lbs for any given period of training. This summer however I began a very serious diet with a fitness app on my phone that I cataloged EVERYTHING I ate and drank daily, with a goal of 3500-4000 calories daily. The app also identified most of the nutritional facts for each food I was eating so I kept track of fats, sugar, protein etc.
My target calorie intake included a shake mix I drank every day post workout in the evening, which I'll probably modify a bit this time around due to the sugar content, but it worked really well. Basically 2 cups of whole milk, 2 tbls of Peanut butter, 1/2 cup of vanilla/butter pecan ice cream, 4 scoops of gainer protein mix( I tried several kinds) and some granola. Its very high calories with good protein.
Throughout the day I focused on eating constantly; I don't naturally have a very big appetite so I worked 6 medium size meals into my routine, instead of three huge ones.
As far as working out goes I hit the gym 4-5 times a week for 45 minutes max, but made sure I was balls to the wall the entire time- no distractions, talking to people, etc. I tended to do isolated muscle groups, but after reading some more I'm going to start this time doing way more core body stuff(squats, deadlifts, etc.) and see how that works out.

So yea , tl;dr, You have to eat smart and have a very focused and consistent workout routine and it is very possible to put on a lot of mass, this coming from some geeky dude who has been underweight his whole life.
Cheers man, I'm obviously a newb at this myself, but I found something that worked prety well so I thought I'd share.

I was 5'6 and 112 going to Marine boot camp. I tell you, that was 18 plus years ago. I tried everything in the gym. Our group was given creatine mono hydrate before it was released to. The public. I am going to tell you. The cold hard fact.......eat a ton of whole foods, drink. A lot of water, stay away from fast food and stick with compound lifts.
Barbells, Dumbbells, meticulous form.
Even with knee and back disabilities, wearing a. Brace on each leg I have been able to achieve 192 lbs on my frame at 18 percent body fat. Slow and steady wins the race. By the way: whole grains, tuna, chicken, fruits, vegetables, protein and water should be staples. Peaches, cottage cheese also good.

Hello Friends, How are you all? I am new to this thread and I welcome to all of you guys here on this thread. Will you please let me know about Green tea.

Well Guys As for your size. When I started I was also 6'2" and weighed in at a whopping 160 pounds. The size will come once you get on a routine that promotes growth and a diet that feeds your body correctly. That's it..

So my questions are:

Do I HAVE to go to the gym to get the results I want? Would purchasing a small bench and heavier weights be sufficient enough for my goals?

Should I try to find a new protein shake that I like that contains more grams of protein?

Since I can't perform a proper squat/bench press/dead lift (due to lack of equiptment and weight) am I essentially wasting my time trying to hit my goal when I can't perform the large muscle building exersises? Or can an 80lbs squat, 80lbs benchpress/flys, 80lbs lunge be enough for me for at least the next 2 months (until I'm strong enough to need more weight to get stronger)?

I typically work out every muscle I can during my routine. I do not isolate. I do, however, work harder on some muscles and easier on others in a cycle (day to day) depending on how I feel and what my body is telling me. My question here is: Am I an idiot? (I'm predicting a huge "YES")

Thank you very much in advance for any help you can offer me. I have never been a part of a forum so I hope this turns out to be a good and useful experience.

-Very Thin

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Okay bud,
I was a super skinny dude in high school. Bro, I was 5'5 and 118 lbs in high school in 92. I am going to tell you the following: Now at 36, through smart training and diet I am now 190. Here is the thing......eat, a lot. Watch the Lays chips and get your calories from whole foods. Fruits, vegetables, amino acids, whey protein, oatmeal, etc. for cereals I recommend things like granola and Kashi.

The weights you have can be challenging. It is all about rep tempo when you have lighter weight. Best I can tell you is super slows......here's the thing......take 3-5 seconds on the eccentric and concentric part of the exercise.....don't go to lockout on the eccentric or concentric part of the exercise either as this keeps tension on the muscle. A good physique can be obtained, just be
patient.

Oh and you can only ingest 25 grams of quality protein at once....So all these neat proteins that promise 50 grams and all is just giving you a more is better attitude is not doing you any favors.

You're usually better off spending your money on a monthly membership to a local gym or even the YMCA. Don't be intimidated by the regulars who have been lifting for years. With a few exceptions most people are very nice and will gladly spot you or lend an ear when you need it.