It's been about 10 years but I used to have my NSTRA judge's certification.
NSTRA is really a put and take trial. Each brace of dogs runs a 40 acre field that has marked boundaries with a 30 minute time limit. 6 birds planted on the 1st brace, 5 birds planted on each additional brace, scores are 0-100 per find/retrieve, one scored back, one score for obedience, one score for field coverage/dog work. Non-planted birds are not scored, for example one year we had a hunter shoot a woodcock during the trial, legally because it was in season, but not scorable.
It's a lot of fun for both the dogs and the handlers, and for those that can't shoot they'll even allow you to have a designated shooter. It's a good trial for galleries too, with a small field the whole trial can usually be watched from a single vantage point. We used to have 2 trials running simultaneously in adjacent fields with brace starts staggered at 15 minute intervals so there was constant action all day long and trialers could get double the trials in on the same day. Traveling is probably the worst thing about trialing in my opinion.
If you go to the NSTRA website there should be info about the region in your area and when they hold trials.