newmac, welcome to the addiction

. All the advise you'll get here is as good as you'll get anywhere. Yea a new system will help you, will it make you tons better? Probably not, there is a HUGE learning curve here, I have been in game just over a year, I'm not sure I'm even average yet ( probably not in all truth) . Find a trainer, and work with them, pick a plane and stick with it till you know its abilities inside and out.
Don't be afraid to ask questions, take films and have others look at them, it is a steep and tall hill, but you will hit a point where it all comes together. Then you'll start to understand things better, fly better, and not always be cannon fodder.
Did I mention the HUGE learning curve here???

Most of all, remember it is just a game, you play to have fun, hang with different people and get away from real life for a while.

Have fun!