Want to build costom turbo kit. Need advice from boosted guys!

[pimp my yaris]

I want to build a costom turbo setup using mostly E-bay parts. I am thinking t25/28 turbo. I have found exhaust manafold/turbo, intercooler and piping,oil and water lines if needed. Also a air intake and filter to mount the mass air sensor. I am sure I will need to buy at least 1 more intercooler piping kit and a blow off valve. And I found a downpipe witch will need to be costomized from a nissan silvia. Or I will need a complete costom downpipe.

My questions are what piggy back system should I use to control injector pulse? Will I need bigger injectors right away? I am only looking for 150-170whp. Also should oil source for turbo be tapped from oil pressure sensor or do I need to buy adapter to tap near the filter? I am also sure a new clutch will be in my future shortly after install. I am thinking center force dual friction.
Also can I tune a piggy back system with a lap top and a wide band o2s or do you need some specialized training to complete this. I am a ase master tech for about 12 years, but I have never done tuning. Its just so dame expensive around Chicago. Very few places to go.