Before you yell at me - I did read the stickies!

Ok,
1. can i do HIIT cardio for lets say .. 15 minutes? I want to have better endurance.. oh and I can't avoid some fatty food cuz thats all my mom makes so I gotta work extra harder
2. I read on the posts that you should do the heaviest set the last (due to muscle memory) but I heard doing 12 reps with a light weight on your final set helps blood flow into the capillaries..
3. I'm not sure how many sets I should do for biceps, triceps and shoulders? I read in some post that people don't do more than 6 sets? If I do that few sets - I won't feel sore the next day and feel as though I didn't work hard the previous day
4. i have wide flat feet so my shins start hurting while I run..
5. Aside from the sodium, is drinking a V8 a day alright for my veggie consumption?