Welcome to the club, friend Chillindan!
I hope you have an understanding partner! Trouble with gliding is it can be addictive! And you end up with lots of mates. Which is the biggest difference between gliding and power flying, we have to help each other to get airborne!.
Prof. Chris Reed gave an excellent summary. Mechta had a good list of things to keep in the boot, I would add to that list a FIRE EXTINGUISHER!
Only because if there is any power on site, like a motor glider or a tug, it could come in very useful, in addition to any that are kept at the club. A couple of lives were saved at Dunstable once, because a passing automobile carried just such an item.
Did anyone recommend that you keep an eye on the BBC forecasts? Countryfile on Sunday eve. is well worth looking at for the week ahead. But at your early stage, be guided by your instructors, who if the weather is too dodgy, will no doubt have words of wisdom to impart in the classroom.
But the main thing about gliding is it is tremendous fun. And you can keep on keeping it up until you are well advanced in years. There is a vista of achievement ahead; first landing, first solo, bronze badge, silver C, etc etc. Rock polishing, dolphining, wave climbing, competition, instructing, and of course helping others.
Happy landings!