Thanks for all you advices and encouragements!
I guess I'll give it a try as i got really good rolls that might compensate the lack of class levels. I am going to play this character more trickery (as his domain) like with stealth and silence, disguise and bluff actions. This one is not meant to be a main caster but should use his spells for buffs and tactic advantages. Although this character never will be a fearsome specialist, he is a secondary caster buffer healer, secondary stealth / skill character and secondary melee (although his HP are bad, i guess his AC is ok and trip might be a good tactic aswell: A belt of growth or potion of enlarge could be usefull ==> better tripping and reach).
And yes some magic items i listed arent priced correct yet, but won't exceed the total characer wealth of 36.000 GP (is that actually right at ECL 9?)
I will ask about level reduction aswell, thanks for the tipp.
Next feat I am going to select hover or improved flight (has improved flight any disadvantages over hover when haven average maneuverability?) and some enlarge person item for hover, trip and reach!
Playing in a party with lots of stealthy players the racial darkness spell might be usefull I guess.
If you are interested i will post how this little fiend will do ...
As i most likely will keep core build i still appreciate any suggestions on how improve his skills (melee/trip, trickery tactics (get in and out combat, usage of his fly ability plus of course good set of spells for secondary casting (buff and tactic advantages) ..