It is possible to enlarge the penis, and welcome to thunders.
A great place to start is the guide to manual exercises, I believe it is in the newbie forum important threads thread.
Start easy, and build your way up. IT takes some time to get used to it, your hands, what you can tolerate, etc.
I would recommend manual stretching combined with jelqs for the first few months and do it maybe every other day or 2 on and one off. You should make more progress. By that time, you should have both gained and read more around here and you can seek more advanced exercises or simply extended your current ones.