If you choose baby led weaning (and perhaps even if not) make sure you get decent bibs. Not just the ones that go around the neck, but the ones that go over the whole front and on the arms. I'm currently doing baby led weaning and LO makes such a mess Of himself, but it's all part of the experience.
People rant and rave about the IKEA basic high chair which is around £10. They're ok (LO uses it when at my mum's house) but personally, my DS sits much more patiently in the one we got from Mamas&Papas for £40 (on sale).
Be wary of allergenic foods. They say to try them as a single dish and not close to bedtime. My DS is allergic to egg. He came out in a terrible rash almost immediately having a bit, then threw up massively about half hour later. Very scary experience.
Try simple foods at first, boiled carrots, sweet potato, mushed peas, bananas. You can mush them up or cut into chunky finger foods and let them try to feed themselves. Don't worry about gagging, it's a part of them learning to swallow. Obviously, if you see them struggling, take them out of high chair and give a swift pat on the back. For this reason, I don't strap my LO into his chair as long as his tray is firmly clicked into place. The last thing I want to do if my little one is choking, is facing about trying to instead him.