Hey man.
As a newbie myself, I'd highly recommend the Cyma 030 Glock AEP. There are several reasons for this:
It's cheap and cheerful, but it gets the job done. It's FPS is somewhere between 200 and 240, so it's enough, but there's no excess of firepower. I got mine for £75.00, two-toned.
It's an AEP, that means battery powered - this means the only cost of shooting it is the cost of the BBS (and the mains to charge it up).
There are hundreds of upgrades available for it - it is basically the same as a TM glock18, so all the parts fit perfectly. Since I got mine, I've bought a weaver rail attachment with a silencer thread, a red dot to sit on the weaver, a 14mm silencer and a 100 round extended magazine and a spare battery! You can get new springs, gearboxes etc. to up your FPS if you really need to as well.
The main reason I suggest it though, is as above - you should really hire an AEG from the sites you're playing at and get an idea of what you like, then when you've got UKARA you can get one that's not two-toned. I think most sites would be fine with letting you renting an AEG but bringing the glock along as a side arm, so you can get the best of both worlds!