Brushless savage questions

[Joram]

Hello,

I bought a savage x roller and the flm kit. I'm going to run it with the MMM esc , don't know wich motor to use yet.

This are my questions;

What motor for my savvy? It's going to run on 6s MaxAmp, 5000Mah

And i heard different stories about braking and the gearbox:

Can't you brake with the motor when using the 2-speed??
I'm going to use the orginal braking system but do i need to shut down the brake??

And if i lock the transmission into 2nd gear then i can brake, right?
And how to lock it into 2nd gear...

Greetz,
Joram