Welcome to the forums, count urself as the first person ive introduced since my 18 hour rule came in.

Hmmmm, basics...lets see how basic i can get.
There r 7 classes, 6 normal+1special. They are mage, swordie, thief, acolyte, archer, merchant, and novice, which acts more like a super novice. Theres basic 8 direction 2D movement with 2 different types of attack, strong and weak, strong is slow and heavy and weak is quick and...weak. Each character has 2 genders and each gender has different styles with skills attacks movement and so on. Each class has its own skills. Skills require certain button combos to be pressed. Same stats as RO. Hmmm...im lazy.
If u want a better version of this, go to the members section and RBO game FAQs.

Have fun.