Not had a look at these myself, but this guy's
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seems like a pretty comprehensive selection of poses for you to start playing with. I'd recommend hunting down a pose-sorting mod (there's a few available from the same page) as there's over 420 poses he's collected and added to the mod.
To access them, make sure your model is selected, click Anim > Kinematics > Pose. Any poses you create using Kinematics > FK or IK can be saved there, too. So you can start building up your own collection once you get to grips with how the tools and posing work
As you can see from the screenshot, the vanilla interface is a little crappy, and if you're going to start loading it up using hundreds of poses, a mod to help to sort through them easier is recommended.
View attachment 711701
Have fun!