As far as tempo goes, you will see it's very easy to adjust it in the control bar window. It'll say 120 and clicking in that little window will allow you to use the + and - buttons or highlight the 120 and type in what you do want. Do it at the very beginning otherwise you'll get 120 changing to the new tempo. You can change the time signature there, too and the key if that matters to you.
Ditto on the Groove 3 suggestion, too. I've learned tons of exactly what I wanted to know, from subscribing to their All Access Pass for the past 4 years.
Once you get past the first stages and have AD2 working and are using it, you'll discover how useful and open ended it is. Especially the beat transformer! You can make a pattern play harder or softer, mute whatever, mix it up or down, adjust the bar length and then drag that into your song/project.
Get that far and you can start customizing the fills, or as mentioned above rewriting the bars where you want fills.
It's very flexible!
Best of luck! You'll get all the help you need here and Groove 3 is a huge resource, too.
...and don't hang yourself up on the midi part at all. It's really more about finding a pattern you like and tweaking it, then dragging it into your drum track. EZPZ
Michael