1st thing is sizes..........all AN fitting are based on 16th's..........so a #4AN is 1/4". Just divide the the number 4 into 16 and you get 1/4" and so on for the rest of the numbered AN fittings.
Next and Pat is right, if you start with say Earls lines, then stick with Earls fittings.
I have used braided rubber lines for fuel but when it comes to transmission cooler lines & power steering lines, I used Aeroquip with the teflon liners. They are very different to connect to the braided line. They have a ferrule that has to be put between the outside rubber and inside teflon before you stick the threaded connection into the hose.
To make the braided hose connection it is critical the when you put the threaded part into the hose and start turning it ,you do not push the hose out. I also use a air cutoff tool to cut the braided line. Just measure where you want to cut and then put a piece of electrical tape and on the tape make your mark. When you cut through the tape it is less likley to fray the ends of the line.
Since this is the first time doing this I would get someone who has made them to show you all the little things you will need to know.
Another thing..........get ready for lots of tiny pin holes in your fingers!!!
You will spend some bucks on lines and fittings and if you do not get them together correctly, they will leak .