i think you are lucky to stay skinny while you eat a lot...i don't see it as a bad thing at all.....just eat normally you don't want to gain weight in fat it would be ridiculous and unhealthy. eat well but do not eat junk. eat lots of carbs 2 hours before workout , and protein and fruits (fructose) after workout. gaining muscle will not happen in a day or 2, it is a lifestyle...so you have to be convinced of making bodybuilding a lifestyle. results will come, be patient and most importantly do not rely on any drug, there are no shortcuts.
your new to the gym just lift and eat. If your on a budget, oats, chicken, eggs, brown rice can all be bought really cheap. Milk as well normally i stay away from milk but being that your skinny it would be better for you to spend your money on food and a gym pass then an over priced whey.
"Stop what you're doing, cuz I'm about to ruin, the image and the sound you're used to. Look here, I love that Humpty song. Stop cramping my style, man." SI