Hi Andy,
Re protective suit: I wear an overall with a hood attached (from Beeware I think), and would recommend it. You could also just get a jacket (but with a hood attached), and then use either thick jeans and/or waterproof overtrousers on top of your normal trousers. Overall is just easy on and easy off. If you jet get a hat/veil, the bees will find a way in!. Also get a good fitting pair of leather gloves, with cuffs that go up to your elbow. PLus normally wear hiking boots or better wellies.
I bought most of my basic kit from Thornes, got quite a bit of hive hardware from beekeepers that gave up. Thornes is quite expensive, and their delivery costs have shot up recently. So if you can go and visit them/collect it would save you a bit of money. However, for your first year (without your own bees I guess), just go along to apiary visits with your local beekeepers group, you will need your suit/gloves for that.
And get yourself stung (with other people present), so you can be certain that you are not allergic to bee stings. But don't do it in a silly place - your (left)hand/arm is good. I got my first sting in the ear (it wasn't planned), and looked very lopsided for a few days....
I can't see where you are based, but PLEASE do not go and buy bees/queens from the internet or any of the dealers that now offer. You will get the best stock from local beekeepers, as these are bees acustomed to your locality, and they will not bring in new diseases or change the local genepool. You might have to be patient as bees are in short supply atm, but I am sure there are quite a few local beekeepers that would welcome help with their hives, as they may be getting on a bit...
If you are buying second hand kit, you will have to sterilise the hive and re-do all the frames with new foundation, plus sterilise them too (before new foundation). You can either use steam and/or bow torch. Other beekeepers can explain.