Pilotz old chap.
Well done on being ahead of the game, I had my first lesson at 19 and didn't get my PPL until I was 22.
Circuit calls vary slightly with airfield, although as has been said elsewhere, get a copy of CAP 413, which will tell you most of what you require. At a busy airport like Leeds-Bradford, flying one circuit, I'd expect something like this: -
"Leeds tower, G-ABCD, radio check and taxi with Delta"
"G-CD, Readibility 5, Delta Correct, taxi for 32 left hand, hold at Delta 1"
"G-CD, 32 left hand, hold Delta 1"
"Leeds Tower, G-CD, Delta 1 ready for departure"
"G-CD line up and depart immediately"
"G-CD lining up"
"G-CD 32 left downwind for touch and go, three greens"
"G-CD, Roger, call finals"
"G-CD, Finals for touch and go"
"G-CD, land or touch and go at your discretion"
I wouldn't normally make base or crosswind calls unless (a) I'd been told to, or (b) I was joining in that position.
G