Glad to see you've taken the time to get to know the site. We try to keep things organised, which is why we request that people do not ask questions in the introductions forum - as detailed in the big sticky which appears at the top of the intro forum:
Posting your introduction - please read first!
Now about your questions - please keep separate issues on separate threads - otherwise we end up with a big mish-mash of information which people have trouble locating later (and you know how that feels don't you?)
Some of your questions (about tax and payroll are related), I do recall a few threads about contractor type issues which would be the best place for those questions. About tax, I'm sure we've covered those before, the bottom line is if you want to save tax, then move somewhere where the rates are lower. Without saying how much you earn it is impossible for anyone to have the information to give you an answer. See my signature also on a guide how to search effectively.
Just to be clear again - use the intro thread as a way to introduce yourself and get to know others - not for specific issues you need help with.