@stevewiley Welcome to the group, Steve. You’ll find it THE place to come to for help and advice should you decide to buy a Long Mill. Even if you don’t and “gasp” buy a different brand, you’ll find help here with software and tooling.
In terms of add-ons, much depends on what you plan to do with your Mill. Here is a recent thread from a Long Mill “waiter” who asked the same question:
@Jammer As an aside, welcome back, Jeff. Long time, no see you on the forum