Can anyone help!!?

We have only really ever had family babysit my son (he's 5yrs old now), and of course they do it for free!! But now, for various reasons, I can't ask family, so was thinking about asking a neighbours son (he's 18yrs old) to babysit for us. He has got a child care qualification (Cache certificate I think) and has experience of working with children, as well as having a 4 year old sister. He's always pleasant and seems trustworthy.

Its not that we go anywhere on a regular basis, just for the odd time I would be nice to have someone handy to ask.

So, if we ask him...

- Are there any rules, regs, laws, etc. regarding letting him babysit?
- How much do you think we should pay him?
- What does everyone else pay?

Thanks