Back up a few posts in this thread, and read what A-Jay had to say.

 

That' all the tutorial you need 

I agree that backing is a pain because it's hard to get the spool filled properly.  You get pretty good at estimating the more you do it. 

 

If you really want to do it right, 1.  Put the amount of line you want to use onto the spool first. This is the length of line you want to end up on top of backing on your reel.   2. add backing to the level you want on the reel spool.  3.  Move it all to another reel (I keep a couple old reels around for this-they must be able to hold more line than you expect to use.  Now the backing is on the bottom, but not on the reel you want it on.  4. Move it to another "slave" reel.  Now the backing is on the top.  5. Move it to the reel you want it on, the backing will be on the bottom and the line you want to use will be on the top and at the right level.

 

What type of line for a starter fisherman?  I don't see a problem with braid if the son is going to be under supervision and mature enough to understand and follow instructions.  I think mono over about 8 pounds is often too stiff for spin.  Florocarbon is simply too fragile and stiff for spin for a starter fisherman.