If you make your start and end loops 1/2 the distance between pegs 1 & 2 you will have a 12/10/8/6 taper.

lets see if this helps. This will make a 7' leader.

When using a leader made from 4# test mono or fluoro I'll use up to 6' of tippet.
at least 4' of tippet with a thread leader.