My wife has a trust and that trust will start a new PTY, it will be an investment business

I (referred to as John) will loan InvestPTY money on which it will pay John interest. InvestPTY will invest the money on trading online (Forex, Indices and Commodities), profits made from the trading will be reinvested into Real Estate owned and rented out by InvestPTY. Any profits made by InvestPTY will be reinvested in Real Estate

1. If all this is possible is my understanding correct that any money received by InvestPTY is consistently reinvested in new real estate and improvements to existing real estate, will any taxes need to be paid like CGT?

2. Should InvestPTY be charging VAT on residential property? (if a private person is the renting tenant)

3. What kind of interest can be paid to John from InvestPTY for the loan? Is that taxable?

4. What will be best for InvestPTY a PTY or Shelve CC?