Need some advice :)

hi. i just want to start the game. and my question is that how can i be rich? which is the class that i need for it?

 

you have several way to make some adenas.

enter in top clans in a good cp.
level some 85 chars to do multiple zakens/freya instances.
farm crystals and sell them with a dagger in soa.
chain all raidbosses you see to sell drops.

then there is the pay solution buying and selling l2store to others players

 

there are some classes which will be "more needed" in high levels, so you will find more easily some parties : healers, tanks, buffers (aeore healer, sigel tank, iss buffer). ofc it needs you to play assist.

if you start the game, try to give a look to the elesmira post about leveling/making some money guide.