At this point I would not suggest using anything. Get your body used to some serious lifting. At the same time put a log together with what you are eating. Break it down by columns. One for actual food and portion, 2nd how much protein in each serviong, 3rd carbs per serving, 4th fat per serving. There are websites to assist with thes. However I am old school, read the back of every package you eat, and weigh out everything you eat. This will help you precontest also. It will become your lifestyle if you are serious.
The reason I want you to do this is so you can teach yourself how to modify your diet. Anyone can add or subtract a meal. But to know exactly what you are doing is a bonus and is a must for any competitor. Once you get that knowledge and you body used to eating more we can talk supps.