From the sound of it, you have absolutely 0 clue what a Lineage 2 server requires. Why don't you just download a free pack from L2j and look around before you actually think about sinking money into this? @illluz
It always depends on what u want and which root u will follow.
PTS files - from advext 345usd for C6 - 575usd for GF and later.
Features - since PTS is harder to modify u will have to pay for a programmer or buy from advext the super expensive addons or it will be free if u know how to code yourself.
Machine - depends what company or if homebased u need a good machine with large amount of RAM the more the better + 100mbps internet
Website - if u