best position to start out.

[SWFLguy]

This depends on:
1) how your official's association promotes its new officials
2) what position your are most at ease with
3) Your own expectations
In many associations, the newer officials are assigned "wingman"
positions, typically Linesman. If you have any desires to be a
"white hat" work hard at the L and move on to R.
I "fell in love" with the Umpire slot early on and never had
any desire to Referee. I worked on improving my skills and
in an association that rewards its best officials, you will
get "big" games and soon play-offs, and championship games
if you really do the job well. A ratings system will allow you to work
on up to State level play-offs.
Good luck !!