Judging from what you wrote you are pretty new to this, so I can tell you right away chose something else to do. Anyway to answer you questions.
Do you think i can earn much with it, how much per month if so?
Pools earning are percentage based, so your earnings will be based on number of users mining
And wich script do you suggest? CoiniumServ , Unomp or another?
Big pools are running their own custom made scripts. If you chose to run pre-made script, you will be just like 1000 other pools
And are there other things that i need to know?
Should be experienced in server management. Running a pool is not that easy, if something breaks and inexperienced guy like you is running pool, how do you expect to fix a potential problem ? Other thing, there are thousands of pools now, why would someone mine on your pool ?