A good start
Would be to check out the pic thread, read everything in this sub forum and slow down a bit.
You will want to think about an optic, ammo and plenty of mags!
That's what I did first.
I hope you DON'T have a clean credit card, if you're not carefull you will get the sickness the rest of us have!!
Don't be afraid to ask questions of the group or an individual here...we're all friends and would love to watch what you build.
Good luck and ask away!!
Regards,
Mark