I develop most maples by chop and grow rather than wiring. You can wire those trunks and make as many bends as you like but no amount of wiring and bending will give the very important taper in the trunk.
Before deciding what to do you really need to decide what you want to achieve. Bonsai means many different things to many different people so you may get lots of conflicting advice just because each person has different outcomes in mind.
Bonsai can have thick trunks and well ramified branches to really look like real trees or they can be small, skinny trunks in small pots with a bushy canopy but no real defined branch structure. Striving for the former will take quite a few years and some skill. If you'd be happy with the latter it may only take a few years.
Note that starting with young trees is one of the slowest ways to bonsai. It is far quicker to take a larger tree and cut it down to a bonsai.
Seasonal tasks will depend on location and I note there's no location on your profile so it is hard to say when to do anything. The trees appear to have no leaves already which, I guess, means a colder, northern location but it is far better to just add your location in your profile so it appears each time you post.