If it's your first laser, and your planning to put together a green laser from scratch you are going to need to do ALOT of research, have an extreamly steady hand and ALOT of patience as well as a lot of experience which you seem to lack.
I suggest either buying the module whole if you want a green laser, or starting of with a phr or LOC build.
Green DPSS lasers are next to impossible to put together from scratch.