I have been flying RC Planes and Helis for some 10 years now. Been a member of the BMFA and in a BMFA Club all that time as well.
I cannot stress how important it is if you buy a RC plane that you join a club. Last year on here some guy was building a wot 4 I think it was, a few of us gave him advice but he didnt listen and I believe the plane ended up smashed up (i could be wrong, but I think I recall he crashed it)
Also with a flying club you will get someone to check your model over, you may THINK you have built it correctly, balanced it, set your throws correct etc etc, but there are other things to consider.
Also whenever we have new people turn up with there 'trainers' one of us, ie the more experienced pilots, will take it for a test fly to check it is ok.
Then you can learn on what we call the buddy system, whereby you and a instructor have a transmitter each, connected with a wire and the instructor can take control at the flick of a switch if you get into difficulty. Remember, it is easy to know left and right, up and down when it is flying away from you, but when it is coming back to you it is all reversed and it is very easy for it to A) get a long way away quickly and B) loose orientation.
ALSO the idea behind the BMFA and flying at designated sites is that, yes you can choose to go and fly in a field in a park, but what happens if you loose control and it goes out of sight, lands where children are playing.
Also, you could be flying on a similar/same frequency as another flyer who for arguments sake, is flying at a BMFA field with his £2000 RC plane. You could cause him to crash. He would not be happy.
Join a club, it is the sensible approach. Any good model shop will tell you that anyhow.
We went through all this with the other guy last year. Not sure he listened, (like I said, I could be wrong)