Considering that this is your first classical piece I'd say it was a good start. The piece does have a certain charm to it that is attractive to me.
However, I do have some questions. What was your approach when you finally decided to compose this minuet? Did you consider the form of the piece which includes harmonic/melodic layout? Aside from the "certain charm" the music seems to wander in a way that suggests you had not thought out the layout of the piece.
I think if you perhaps study some easy keyboard minuets to get an idea of form for your own minuet you could have a very nice piece.
Anyway, it was a good start
