Youll have loads of fun with it mate
I found this guys videos very helpful when working out what is what and he also does a few vids on the new drone regulations and breaks them down.
https://www.youtube.com/watch?v=v6h2_HfTP6g
Hours of fun and bitten fingernails ahead. Have fun. Could I suggest you take a look at Litchi software. It allows you to pre-program a route and take photos exactly where you want to. (although I have not kept up with DJI developments) It could be useful for your roofing excersise where you do not want to miss a shot.
One other hopefully helpful suggestion - take a spotter with you especially early days. There's so much info coming at you it is easy to lose track of the drone.
I do think summertime many day ticket or even smaller club venues can be busy all the time.
I have gone to fish a club venue, the park lake, Suffolk Water Park and Hintlesham midweek and found no available swims!
Compare that to my syndicate, where the most I have ever seen is 10 anglers on 45acres.