Hi Cogy,
1. If you want to earn money then a CPL
2. Whatever hours it takes to get your CPL/ FI(R)
3.Depends where you live many FTO's recruit the FI's they have trained.
4. £12 -£15K if your lucky, some schools pay a retainer while some give you a tenner for showing up.
Hope this helps, use search for more details.