Hi Skinny Dude,
i posted a thread on building muscles for skinny people and i assume you would fall into this category.
One thing i find important for skinny people to build muscles is to eat a meal high in complex carbohydrates and quality protein within 45 minutes of working out. It is extremely important that this meal should be taken first after the workout before doing anything else.
I posted an article on this topic also. You can read it here
or visit my website for more useful content. Hope you gain bulk fast. Cheers.