just discovered this site when google searching info for Ibiza virgins

Looks like this September one of my big dreams will come true, going for a week to Ibiza!
We are 2 single girls so wanna get partying in the bigger clubs such as Space, Privilege and Amnesia and see daytime parties, drink in exciting bars and have an afterparty coffee in a nice, relaxed cafe while watching the sun rise :))
Want to visit Space on a Sunday, I know that the club entries are quite pricey as well as their drinks. Have seen on here that the weather is quite promising in the first half of September, is that right? Would be good if we can still sunbathe on the beach and swim. Will we need a cardigan with when going for a night out? Just to know what to expect.
Having said that we've never been there, would like to find out from real ppl here what's their experience, good or bad, which part is the best to stay if we wanna rent an apartmant. Wanna be able to sleep after a night out, so would be good if our accommodation is located in a quieter part, although we dont want to be too far from the "action"

Its just really the typical Ibiza-week plan, party/drinks at night, then have a sleep, go for sightseeing/swim on the beach, bit of shopping, try some authentic dishes and do all this without busting our savings!
At this stage we dont know exactly how many of us would be going, at least 2, max 4.
Some other sites say that the food and drinks from off licence shops are quite cheap...?
If anyone with local knowledge knows anything that's strongly advised to do or not to do, pls share it here!
Thanks in advance for any replies!!!