Welcome.
It's good fun, and a good forum with some very knowledgeable people.
Get a GAS mig
They are much nicer, you can see a decent weld pool!! And if at all possible, use the big bottles of gas. the tiny Machine Mart/Halfrauds gas bottles last about 6 minutes.
As an aside, if you are also new to welding, check out
http://www.mig-welding.co.uk/ There is a forum there as well, and they are, once again , friendly and knowledgeable.
Good luck with the build
Sean