Have you ordered the ATF orange book yet?
That would be the place to start. I looked into this in the past for obvious reasons, as staying legal in this profession is very important.
Also you need to find a location where you can set up your storage magazine, and get approval from the local fire department. If you live in a city you probably will have a hard time getting approval.
There are strict requirements on where you can build a magazine, how it must be constructed, how often you must visit it, etc.
As for the fuzes, those type of companies usually require bulk orders, which would probably be cost prohibitive for you.