That is probably the most important, peoples feedback who have a great amount of experience composing, all of which should be taken with a grain of salt.
I have found my own style, and at the university about 2/3 of the composition professors love it, and the other 1/3 i'd say don't quite get it.
It's quite funny in the jury at the end of the semester, they listen to what i've worked on, one professor will say to change somthing, and then another will say to leave it as is :P
You should probably start off with a solo instrument, or a simple combination of two instruments. The first piece I chose to write was a Violin Duo, with an orchestration book by my side the whole time.