To figure out how many calories you'll need go
here . He gives you the calculation for figuring it out. You'll be amazed. I seriously doubt that if you can only eat 4 times a day and don't really have any money that you will be able to get all of your calories in.
Don't rely on junk calories either or you'll just add all kinds of fat on top of any new muscle.
I don't really know what good most of those free supplements are going to do you if you're not getting good, whole food as the base to your nutrition. Any supplementation should be just that,
supplementation.
I'd find a friend who works at a grocery store. :p