A good place to look is Apple's Find Out How tutorials, and their Switch 101 page. There should be enough info there to get you started. As for your beloved keyboard shortcuts, there probably are equivalents for almost all of them, plus some you've never used. You can see a list of system-wide shortcuts in System Preferences:

Also, shortcuts for each application are listed in the menus (the Menu Bar is another thing to get used to):

The symbols used next to each key denote the modifier keys:
- ⇧ is the Shift key
- ⌘ is the Command key (sometimes called the Apple key), the equivalent of Control in Windows
- ⌥ is the Option key, the (very) rough equivalent of Alt in Windows
- ⌃ is the Control key.
Another hint: if you hold down modifier keys while looking through menus, you'll sometimes see more options show up. For example, I can see that ⌘W is Close Tab in Safari, but if I hold the option key, it changes to ⌥⌘W, Close Other Tabs.
I have another major tip as well. When you're trying to get programs to interact with each other, or move data around, simple drag & drop will work in probably more places than you expect it. (If you want to drag text around to move it, keep in mind you'll have to hold the mouse down for a fraction of a second before you move it.)
If you have any specific questions, of course you can ask those too.