Have you written for orchestra ?
Kinda (I very recently made a pitiful attempt at a symphony).
How do you feel about writing for orchestra ? looks very difficult, confusing, nah looks easy ... ?
Looks beyond difficult, to the point of pain and frustration.
You feel you don't know how to start ?, how to use instruments ?
I start very similar in all my attempts (timpani intro, brass, etc.); I have absolutely no clue on how to use woodwinds, but I (at least, I think) am fairly capable of using strings and brass (and timpani).
You feel you do know the instruments and stuff just you haven't written anything yet ?
I feel I know how each instrument should behave with the rest of the orchestra, but, those ideas get lost in translation.
What kind of Orchestral music you like ? and would like to sound like that ?
Virtually all (tonal) types (like, I love the booming orchestral scores like Brahms's 3rd mvt 1, and the quite serene scores like Mahler's Adigietto); I would love to sound like that.
Do you have orchestral scores ? Have you studied them ?
No; I've glanced over a few scores online, but nothing extensive.