I'm running a stock fuel system.
I got sum mods just basic FMIC,PFC,Boost ctrl,twin-pods, all alloy plumbing.....

I wanna start upgrading and I thought a bigger fuel pump first, I got my hands on a 93supra pump,

would this do? would I need bigger injectors or a rack first?
and af al this is bollocks! then where DO I start?

 

First thing you need is access to or purchase a wideband O2 and an A/F gauge. Without that, you can't tune anything properly.

Next, the fuel pump isn't going to add more fuel to your A/F ratio. Your A/F ratio is limited by your injectors and FPR.

 

right.........
I'm gonna bugger off and learn about O2 stuff

 

As long as you don't bugger off, and bollocks it you will be OK

Putting on the bigger fuel pump won't hurt anything. No reason to wait to install it.