New to investing - profits included in ISA allowances and fees?

I’m new to investing and want to transfer £20k to my stocks and shares ISA. I will be investing in VUAG only. A few questions:

  1. do the profits that will be auto-reinvested into the ISA from VUAG count towards my £20k allowance? If so, how do I know how much of the £20k allowance I should invest?
  2. it states the cost of the fund is 0.7% TER. How will this money be taken, will it be from the ISA itself, or can I arrange for some cash to be placed in an account and the fees to be taken from there?
  3. how much is it to take your money out of the ISA? Are there any fees?
  4. is there a purchasing fee for the ETF I have bought, or is it just the 0.7% TER fee?

Appreciate any help.

Thanks, that’s extremely helpful.