Mechanics questions

[Hoosier_Dave]

1st year ump here.
I've been doing lots of instructional level games -- 1 umpire. I did a older, competitive level game last nite. Senior umpire rips me a new one (nicely, though) about my mechanics.
1. How far does BU come into infield on ball to outfield? He was constantly telling me to come in farther in the infield.
2. Runners on 2, 3. Line to outfield, where do I cover? Partner says that I need to be covering BR going to 1B, 2B. I thought I was to cover play at 3B.
3. Does anyone else sweep of pitcher's rubber between innings? I never learned that.

Understand, I am NOT critizing my partner. He has several years of experience and has done many tournaments. Since we don't have clinics, and I only do rec league, my mechanics are probably not very developed.