Hi Jaf,
Sadly we won't be able to work with you if you don't have an iOS device. As we would expect you to be able to load the game up and play it, discussing the work with us based upon your play.
Regarding the other points:
- We would require an invoice of some sort - even if not official. Paypal should work.
- We would not accept an hourly rate. Instead we would only accept a single fee for the whole job - agreed in advance, and paid upon completion.
Assuming the iOS device is a no-go, then I'll say thanks, but no thanks.
All the best,
San.