Welcome to diving.
I also recommend that you do quite some research on what you would like, and what you actually need for the type of diving you do (and plan to do).
You should probably spend more on some things of your equipment and you can get away with spending less on other things. i.e. spending more on a good regulator will be a good investment, because it is such an important piece of equipment. I would recommend Scubapro or Apeks (but there are many more excellent brands). They make excellent regs in all price ranges, but even the lowest priced model is a high quality reg.
The other important equipment is the BC.
Do you want a simple one, one with lots of pockets, D-rings etc etc, are you likely to travel (you would want something light) or what about a backplate and wing (bp/w) (with which you can incidentally do anything)?
Fins, instruments, mask, exposure suits are all important, but you do not need the top line product.
Diving is equipment intensive and equipment is expensive.
You may also choose to not get everything at once, but add equipment as your experience grows and you know what exactly you would like and need.
Good luck. If you have any specific questions on gear, just post or pm. You will get the answers on scubaboard.