Clinton,
Here is the NHPLAY Signup page:
https://nhplay.com/apply.cfm for when you feel ready. They'll contact you and go over things, get you set up with the right ADW, presumably Amwager given where you live and how much you currently wager. They can also advise you how to fund your account.
Sure, use my name as referral - I confess I and Paceandcap.com make a few dollars annually out of that.
HOWEVER, you should keep a few dollars in TwinSpires because Amwager does not carry any Churchill Downs owned or managed tracks (CD and thus this year's Breeders' Cup, Fairgrounds, Arlington, a few others).
I am working on integrating a bunch of Amwager stuff into RDSS, just like TwinSpires, but that will be sometime next year (results, live odds, wager submission, wager tracking, replays).
Good luck in your new wagering career! I'll leave it to you to share (or not) with folks how your bankroll is doing lately
Ted