Hello mate .
And welcome to the forum .
You will get more results for your questions if you ask the same thing on the "General" airgun section .
But Ill add my 2 cents for what its worth....
As long as your rifles less than 12 ftlbs you will not need a license , Springer or PCP? now theres a question for you? thats a whole can of worms!! personally , I perfer PCP rifles , but each to their own I guess .
As for budget , theres plenty of bargains to be had , Its a buyers market , and a good 2nd hand rifle will serve your requirments well . if you do decide to go with a PCP ,you will of course need to think and budget for some type of charging system , pump , divers bottle etc.......
And no matter what you end up buying you will need to budget for ammo , cleaning kit , targets , gun slip , maybe scope and mounts etc.....
Hope this helps mate .
All the very best .
Andy .