Just started out myself a few weeks ago and I too was having trouble finding places to fly. So I asked here and the good folk gave a lot of useful advice on this thread…
https://greyarro.ws/t/permission-to-toal-when-is-it-required/49785
What I took from that thread is basically, providing you follow the Drone Code, there are no signs to prevent you flying, you fly safely and respectfully with regard to others then with a under 250g drone we can fly pretty much anywhere there isn’t an airspace restriction. It is all about common sense and being sensible. Check for restrictions on Drone Scene or Altitude Angel.
I feel released now and am flying almost anywhere but I still don’t feel comfortable yet flying in very built up areas. There are more things to consider regarding people, cars etc but I will get there.