I need help with Xero set up and accounting questions answered

I need a bookeeper/accountant to set up Xero so that I can use it in a way that makes submitting my accounts easier at the end of the tax year. I need help to issue some invoices quite urgently.

I also have accounting questions regarding my newly incorporated company limited by guarantee, although potentially I can meet with an accountant regarding these after the Xero set up:

Questions:
Can I claim expenses I made from my own card before I formed?
How to go about a directors loan? Any paperwork needed to lay out the terms?
Can I invoice for services before I register for PAYE?
What are my options for paying myself as a director of a company limited by guarantee?
I have some invoices I need to write but I'd like some advice on Xero set up and things like PAYE and the order I need to do things.
Register with HMRC for corporation tax - how do i know if I need to pay corporation tax?
Register for PAYE with HMRC - when to do this by.
How does pension and NI contributions work?