redoing my alarm

I got a new alarm the other day and I want to start off from scratch. As of now it has aftermarket door locks (no OME lock/unlock switch - has 1 small on/off/on momentary switch), and aftermarket siren (from previous alarm installed).

First, I want to install the door locks to the momentary switch how it would be somewhat like normal, but just with one lock/unlock switch. If anyone has a diagram or knows where to find one. Or can tell me what I need to do.

Second, I want to wire up the alarm so that I can unlock the driver door on the first hit of the unlock button on the alarm transmitter. Then on the second, the passenger will open. Also it has a ignition lock to it, which I would also like to have (vehicle is in gear doors lock, vehicle is in park doors unlock).

Third, this is just something I am curious about but there is an aux wire to this alarm which a remote engine start can be added, how would I go about doing that and would I need a whole new system? I do not want to have a bunch of remotes hanging from my key chain, it's annoying for me.
If I can use the same alarm (have it work "all-in-one" style), any diagrams? thank you.

The alarm I am working with is a ScyTeck SA 100 Series alarm - aftermarket door locks and siren unknown BUT work like new.