Just pick two fleece pieces that are the same size. I have made mine anywhere from 2 yards each to 3 yards each (so I can sit on it and wrap myself in it. I usually sew the two long ends right sides together then flip out and tie just the two shorter ends. You can get crazy and buy the new June tailor expensive fleece rotary cutter that creates the fringe for you - it comes in 1" and .5" widths apart OR cut your strips with a scissor OR regular rotary cutter.
My friend has the June tailor ruler that has 1/4" slots in it that you can measure how many inches you want each strip to be (I usually do 8") and then use the slots to cut your strips every 1/2. Then slide the ruler over so that you will have very even and consistent strips.
When I don't have my friends ruler, I line up my longest ruler at the 8" mark from edge and to be honest, I just use my rotary cutter and slice the fabric until it hits the ruler - I just sort of eyeball it. Or (I am full of "or"s tonight) you can take another ruler and form a T with the top one and use that to cut your strips with.
Some people cut a small square out of each corner to make a cleaner edge.
Then just double knot your ties. Hope thats clear enough.
Then just