What do you do when you go away for a week or two? I'm going to be going away at some point in the next couple months and I'm not sure who to have look after my fish.

When you're going away for 1 week I wouldn't worry too much as fish can go that long without eating and if you do a water change before you leave the water quality should be fine too.

When it's 2 weeks I would get someone I trusted to feed the fish but I'd write instructions and make sure they understood not to overfeed. A lot of people will put each day's worth of food in a baggie and hide the rest of the food so that their pet sitter can't accidentally or intentionally feed more than they're supposed to.