Ok, I am confused. Two Questions?

1. Do I alternate days for sets? I would guess that is so?

2. On Day 1, Week 1, I am supposed to do five sets. In set 1, column, 3-5, do I do 3-5 pullups twice and that is one set? Then Set 2 would be 1 at 3-5 pullups and set 5 is three x 3-5 Pullups?

3. Given that each column has a span of 3 to four from low to high, do I start with lowest or inbetween?

Any clarification would be helpful.