What to do for drivetrain?

Arugably it has to be 6 motors to have a chance at winning (if your region has any good teams).
A good intake and mobile goal mech won’t matter as much if you get bullied around the field by a robot with 50% more motor power than you. If you can please use 6 motors.

Use hot swap motors - taking out the motor cap screws and using rubber bands/zip ties to hold the back and cap together, enabling you to swap out the backside quickly in case it overheats.

I assume you are using 3.25’’ wheels, as that’s the only viable wheel size for blue 36:60. It is a mid ratio, I would recommend 400 rpm (blue motors geared down 48:72) if, hopefully, you’re using 6 motors as it’s fast but good enough for a new driver. If you’re using 4 motors (which I do not recommend at all) blue 36:60 is good, or green 60:36 if your torque is really lacking.