What is a good jig mold to buy for make customs jigs?

It depends on what kind of jigs you use.  I fish for smallies around rocks most of the time so I pour football heads.

i would want a good style of jig for largemouth

This is such a broad question as everyone has a go to jig that only works for them. Since I have been doing this going on 7 years. I'll give you my input for what it's worth. Like IDbasser said. Football jigs for rocky areas along with Arky Jigs. If you are going to swim or hop it around grass, my choices would be a Poison Tail, Snootie jig, Bullet bass jig and a Grass jig. These are tapered in profile for moving through weeds. Then you will have hook selection but that is another long story and based on what you like. If you are first starting out and need more help PM me and I can give you some good info.

For LM I love the Arky, poison tail, and flipping jigs from Do-It.

ok thanks for the help guys