Separate names with a comma.
It probably doesn’t make a huge difference but you shouldn’t really net off your expenses as it means your turnover is recorded...
Strictly speaking if you’re a business they shouldn’t be charging your Irish VAT and it should still be a reverse charge supply even...
Yes. For future reference:
Under the general rule, assuming B2B, where the client belongs.
This. Unless you are on the flat rate scheme in which case you should not include it in box 6 as it’s not part of your flat rate turnover.
It's not zero rated. It's outside the scope and needs to be included on box 6 of the VAT return.