Up in the top left corner is a box called the "inspector." There you can find a dropdown box next to Quantize. It allows you to pick different signatures to snap to, but 1/8 notes tend to work for me.
Then to get consistent velocities, in the piano roll click on the "functions" menu in the bar above the roll. Transform>Fixed Velocity. Then you can pick a velocity (like 120) and click Select and Operate. This will change every hit to 120. I personally prefer Random Velocity, and then setting a tighter threshold like 100-120. That way every hit is between 100-120, and is consistent but not exactly the same. And then I manually change individual hits that need different dynamics.