need help with brake light wiring

You should find a grn/rd wire and a grn wire that go to the switch. The grn/rd wire should have power and the grn wire feeds power from the brake switch to the turn signal switch for the brake circuit.

Did you cut the wires to the Turn switch also? There are actually two wires that feed the brake lights since they double as Brake and Turn lights. Coming out of the turn switch you have an Orange/Blue that feeds the right rear and a Light Green/Red that feeds the left rear.
If you are planning a complete rewire of the car, unless you are planning on doing a custom job, you might consider a factory replacement harness. You have to order them section by section, and it might cost a little more than the Painless, but it is sooo much easier to install. All of the wires are cut to length the terminals are already there and its all wrapped up nicely, so it's just plug and play. No cutting, no crimping, no cursing.
If you are hell bent on doing it all yourself and are comfortable taking on such an endeavor, there are universal kits that are much cheaper than the Painless. Like It's a Snap or EZ Wiring. If you don't mind GM color coded wires. I am partial to the It's a Snap kit.
If you want some decent schematics you can go to Summit racing and look up the Painless kit for your car and download the instructions on PDF.

Ahh, so I'm guessing that you aren't concerned with turn signals and just want some brake lights. I hope the info I gave you was helpful.