SilenT: YES! You can make any type of game, weither its an RPG, RTS, etc..etc. However since your new please take my adivce. Don't Make an RPG first! It's Hell! ARGH!!! (Unforunately I didn't take my own adivce, and I started an Rpg...I've lost 2 inches of my hair line to...)
As RPGamer said " Depends on if you can program it". Read all the docs and tuto's you can. Since I'm making an RPG too I'm sure I could help you in some way. IF you have any questions email me. I'll help you to within reason.
"Laugh to scorn the power of man..."