1. I use several programs to do schematics. That particular drawing was done using Orcad (Cadence Software). I use the full paid version at work but use a demo version at home.
There is a demo version here but I think you need to download using a business email etc. Not sure as it has been awhile. It is limited but I did discover if I create parts libraries at work on the full version I can export them and drag them home on a zip drive.
2. Yes, both motors share the same common. You never mentioned isolated motors which will kick up the cost.
What exactly, in detail, are you trying to do? Maybe if you explain this in great detail we can look at the big picture.
Additionally, and I may have mentioned this earlier, if you plan to measure current on a single or both motors running that adds a few more caveats.
The contactor that would be RY2 in my drawing would be
along these lines.
You really need to well define what you want to do with specifics and motor data. If this motor is off an old electric motor and battery powered it can't draw too much current or the batteries would weigh a ton.
Anyway, without much more information, we are sort of dead in the water as to a how to or ideas.
Ron