The best help requests start by saying what the user has already tried to solve the problem, so after reading your question, 'plzzz' don't mind if I base my reply on assuming you've got no idea how to go about this. And, that's OK!
Do a search for NeedROM
and go to that site, first.
ROMs are very specific for the hardware they're being flashed to. Some manufacturers with use the same model number and but make small hardware upgrades without changing the model. NeedROM is very good for this, often showing photos of identification beneath the battery -- all this must be identical to what you see, on your phone.
The same ROM may be available from other sources, but often with enough missing information that you're still not exactly sure if its OK.
If the ROM isn't a perfect match, you can 'brick' your phone. If you're careful, you phone will again be like new.