What you need to make up an artillery piece with limber and team. For 12 pdr and horse artillery you'll need 6 horse teams, for 8/6 pdrs you need 4 horse teams.
These pictures are of the French Old Guard artillery, for some other nations the artillery marching crews and command are from the line range.
You need one ridden team.............
one unridden team.................
one limber...................
one gun for towed mode..............
one gun for deployed mode......................
one strip of deployed crew...............
one strip of marching crew......................
one strip of mounted Officers.................
and finnally one strip of artillery command.