That is a HUGE range!
As you know, the needs of a baby are so different than that of a toddler, which is totally different than 5, 7, 10. This is ever more pronouced if you don't already have children (Which I don't know if you do) or if you are not used to being around all age groups (again don't know).
I would suggest starting with a smaller range and then expand based on what comes up and what you are truely comfortable with.
I am only fostering 0-3 years and already I am having trouble deciding on toys, essentials...ect Because of the differences.
Looking through everyone's experiences there are kids, and you will get them...unfortunatly that is just about definate.
I am just suggesting be careful about streching past what you are comfortable and certain about, This is a hard road as it is.
Best of Luck!!

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February 2008 Foster care classes complete.
June 2008 Homestudy is done!!!!
23 Dec 2008 License FINALLY!!!!!!
Waiting on the babies