Hi Jim. First of all, take your time, don't hurry and study each item thoroughly before buying. If in doubt about the originality of an item, do not hesitate to ask. There are many experts on this forum who will be willing to help, I'm sure. I recommend you to buy your staff from:
1. Dealers with good reputation like Militaria Berlin and Butscheck antiques).
2. Forums (like this one, WAF or GCA).
Regards