The pay rates for contract crew are outlined on the Ryanair website and that is all you get. As a contractor, you do not have a base and as such operate from wherever they need you on a 5 on 5 off roster, totalling 900 hours/year.
For example, you may operate from Prestwick for 5 days, then Skavsta, then Hahn, etc. (I'm sure you get the picture). You will likely operate from Stansted, Prestwick, Charleroi, Hahn, Bergamo, Ciampino, Skavsta and Girona (all -800 bases).
Although you don't have a fixed base, you can ask for a preferred base and you will operate from there as much as possible.
It is your own responsibility to sort out taxes, etc. but assistance is there should you need it. Accommodation, transport, etc. won't be paid for either.
Every single contract pilot I have flown with is extremely happy with this setup and now there are even existing Ryanair pilots going on contract.
Hope it helps