Want to work my way towards a 5s-fte. Options

[cardshark525]

I would like to start working my way towards adding serious power to my car.
I am very new to the details in such upgrades so bear with me.
Being that I am short on cash and looking to take things step by step, is there anyway that I can look to put in the rx-7 fuel injectors, fuel pump and other upgrades aside from the actual turbo, intercooler and piping or is something like that definitely not Kosher?

Understanding that by doing this my car will be running very rich, how much would it cost if I wanted to reprogram the ECU so that it can better manage the new air/fuel ratio and bring out peak performance?

Currently I only have a Weapon-R intake on the car but am doing a full exhaust overhaul within the next few weeks.

Any advice would be greatly appreciated and I again apologize for my newbness.