You send the orders to me, and only to me.
There’s a few options as far as format. Experienced players often use the accepted abbreviations for the territories involved.
Here’s the basics, you will find many examples in the various links and articles here.
A dash ( - ) indicates a move. You will typically order one unit to move from one space to another space like this.
Fleet London - English Channel
or alternatively
F Lon - ENG
This obviously means "Move the Fleet in London to the English Channel.
Often you will want to hold a unit to defend or simply to wait a turn. You order that like this.
Army Berlin Hold
or alternatively
A Ber H
Note, that there is no dash, and this simply means the army in Berlin holds.
There will be frequent occasions where you need to support a unit into a location in order to add strength to the move. That is ordered as such.
Fleet Baltic Sea Supports Army Warsaw - Prussia
or alternatively
F BAL S A War - Pru
This simply means that you are ordering the fleet in the Baltic Sea to support the army moving from Warsaw to Prussia. Keep in mind that you must accompany this support order with the respective move order you are supporting (A Warsaw - Prussia) or else it is void. There are occasions where this could be intentional, but that’s another discussion. Also note that a unit can only support a unit into a province that it itself can move into that turn. For example the Fleet could not support the move A Prussia - Warsaw.
Lastly, there may be occasions where you’ll want to convoy a army across a sea province. This is similar to the support order.
Fleet Ionian Sea Convoys Army Naples - Tunis
or alternatively
F ION C A Nap - Tun
Again, just like the support order, you’ll need to also have the corresponding move order of (A Nap - Tun) to go along with it.
I have no trouble with you using the shorthand, but I highly suggest you make sure you know what you’re doing when you do. Its not complicated, but if you use a ambiguous abbreviation I’ll have no choice but to NMR that unit. For example, in -GRY I had a order that didn’t clarify whether it meant Norway or the Norwgeian Sea. You can also mix and match abbreviations with long hand without trouble. Its very common to abbreviate the unit type (F or A) and the order (H, S or C) while using the longhand for the provinces to ensure clarity. Whatever you choose, be careful, and when in doubt spell it out.