I am assuming the code is AWS D1.1
#1, I would retest the welder and record the correct information according to Clause 4 (BeenThereDoneThat)
#2 see answer to #1
#3 No, 2F is reference to a Horizontal Fillet weld position, that should say "N/A"
#4 I often use the welder's initials and last 4 digits of the SS#, but it could be anything that identifies the welder within your company system.
#5 The actual parameters go in the first column, and the range or parameter that is allowed by the code goes in the second column.
Another issue that you may run into, as it bit me one time....The welder's who were certified by the deceased CWI may need to be retested unless you can vouch for their continuity from the time they were certified. Our CWI had passed away and I was tasked with his duties and position as Quality manager. One day I had a call asking about those continuity records for the guys who were previously certified under the other CWI. That CWI had been hired along with those welders when another plant in our area closed. He had certified those guys while employed at the other plant, therefore I could not vouch for their continuity while they were employed at that other plant. I spent an entire weekend retesting 18 welders in SMAW and FCAW.