I wanted to make a Free Spirit Character, which possesses a little girl (he is the helpful kind one alright

If I raise the force rating to 6 (which is max. at char generation), do I pay 25 points for the maximum (6), although this stat only sets the max. for the other stats ? My answer would be yes, because it's also the Magic- Attribute, but I am not sure.
If I raise the other stats to the Maximum, do I have to pay the 25 for the last, although I can set a new maximum with Initiation and force- "lifting" later ?
If the answer is "yes" to I have to pay them again, when my force/stat rating raises to seven and I want raise a stat to the new maximum ?
Can I use advantages like "Exceptional Attribute", etc. for a spirit ? Which Advantages and Disvantages can a free spirit take anyway ?
If the Spirit posesses a vessel, does the vessels Attribut maxima still apply, or are the Attributs just added, talking about a possible 15 Con (9+6 for human) at the beginning ?
That's it for now, but more Questions are bugging me

Thanks for your concern in advance,
sternenschwinge.