Maybe ask a local driving instructor to come with you on a refresher course? I must admit, I'm nervous about being away from driving at university. I have driven for 2 years already though, so I should be in a better position than you are.
The clutch is there to move between gears, or to put the car in neutral. You depress the clutch fully, release the throttle, change gear and bring the clutch up steadily whilst applying a small amount of power to the throttle. In normal moving conditions, the clutch should be all the way up - You don't need your foot on it, and there is usually a foot rest beside the clutch for you to rest it on. Also, you're advised not to hold the clutch down whilst driving along - That's called coasting. When you're about to stop (such as at a junction) then slow the car down with the brake, and press the clutch all the way down as you get slow (around 15mph or less). If you don't the car will start to judder and then eventually stall.
Does that help at all? I would heavily suggest getting an instructor, just to help you though. Totalling a car would not be good.