I like the 4 finger swipe up instead of minimize all, but you will find what you like

No idea on the split screen thing .. sorry.

Congratulations .. let us know how you like it and if you have questions as you get used to it. You will find that many people switched from windows and had or have the same questions, so search usually provides an answer or some insight.

It's funny, but the one thing I had trouble with is the screen you are presented with when installing an application. In some, there's an installer program you run by opening it, which is a familiar interface to anybody, but many programs you just mount a disk image that you downloaded (by opening it) and then drag the program to "applications", but for some reason that confused me at first. You'll see what I mean and hopefully have a good laugh at it.

Just remember, most of the UI things you may not like are configurable, like the natural scrolling (I turn that off, can't stand it) and disappearing scrollbars (a default that I also hate) and you have to remember to configure things like spotlight search to make it more useful and less annoying. And also tap/drag is enabled in 'accessibility options', not where you might expect it. It will take a little time but you will discover all these things on your own sooner or later.

-David