Not going to add anything about lights as its been done to death already.
From past experience I recommend if it’s your first few times out at night it’s always a good idea to:
1. have a back up plan in case it goes wrong,
2. take a spare light,
3. have a route planned and know where you are when on the route,
4. make sure you bike’s in good working order before setting off,
5. if you’re riding with someone else make sure they’ve done up their saddle pack before setting off down a long bumpy downhill that’s covered in fallen leaves unless you enjoy spending an hour or two searching for car keys, iphone, pump, etc….. :|
6. avoid riding with certain mates if they repeatedly get knocked off their bikes by deer and/ or regularly crash into trees -unless, of course, you’ve a helmet cam :D
7. keep pedaling like the clappers and don’t stop when being chased by a large angry Alsatian :cry:
8. have fun :-)