Welcome back 🖐
Pity about your old toys being destroyed.
1. Do a search on the forum as there have been many discussions about 'best starter gun'
In brief I would suggest to look at JG, CYMA, SpecnaArms and (Double Eagle for certain models)
Painful as it is, we would always recommend renting for your first 3 games to get UKARA registered again. It will also let you see (and probably try) some other toys to get an idea what's out there now.
2. Yes, I think most Baofengs need to have their frequencies adjusted to legally use without a license. But most sites have a radio license which kind of covers you I believe.
I'm sure someone will give more detailed advice.
3. Not sure on this one. Google search?
I'm sure others will chime in...