I think a lot will be the same as K10D, just the photos should have more detail, less noise, camera should be a little faster..
Regarding settings, things like metering and AF haven't
changed very much. Metering Center weighted, AF.S, WB to auto (or daylight, tungsten, CTE depending on your needs). If you shoot raw, disable the jpeg processing things (like distortion correction, CA correction,..) as these things slow down the image processing a little.
If you haven't yet, you might want to try decoupling shutter and AF. To do this, just customize the AE-L button so that it triggers AF, and not the shutter half press. This means you focus with your thumb, but only when you really want to, not every time you take a photo.
Also, I like the customize the Menu colors to red, especially when shooting in low light. Its less intrusive but still clear.
Oh, and check the firmware version. You might want to update it to the latest version. Make sure your battery is fully charged and functioning before you start this.
If you have a smart phone, you might want to download a pdf version of the camera manual. That way you always have it with you and can easily "search" for keywords
Edit: You might also like this, from back in the day:
https://www.pentaxforums.com/reviews/pentax-k5/walkthrough.html#recommended
Oh, and congratulations and good luck!