Hi Tomsdad,
1. Not sure. Think new rubber is best on the rear first to prevent oversteer. In any case, when I changed to non RFT it made a big difference to the ride, so I’d recommend doing all 4, if possible.
2. I went for Goodyear Eagle F1 XL assymetric. Would recommend. Not tried many other brands yet though, so hopefully others with more experience will add. Mr Wilks...?!
3. I have 2 cans of Holts tyre weld & electric pump in the boot. Apparently it can be washed & and the wheel reused if a repair is suitable. Never used it... yet. Would be happier with a space saver E46 17” wheel & jack if I could find a good deal, and was planning a long trip. Don’t get a smaller, cheaper space saver as it won’t clear your brakes.