At the most basic level...top row are your gear's outputs and the bottom row are the inputs.
From there you can then consider normalling or half-normalling some of the gear, which allows you to "permanently connect something like the outputs of preamp to the inputs of your interface/recorder, while allowing you to "break" that path and insert something like am EQ in-between, or just to redirect the outputs to some other device. When you "un-break" the normal, it automatically goes back to the default connections.
Use of normalling/half-normalling allows you to "save" on the number of patchbay points. While some of my bays allow for normalling, I just like to use a basic output/input setup, and just patch things where I need them rather than rely on the normalling. It's a very small, spring like connection, so there's more chance of dirt-n-oxidation to form than there is just using the jacks with a basic output/input setup and patch cables.
What style/size are you using...1/4" or TT/Bantam?
BE careful with preamps....IMO, it's better to have a separate XLR input bay, and only connect the line outputs of your preamps to the other (1/4" or TT) patch bay where the rest of your gear is. Plus...less chance of issues with ground loops/hum and phantom power problems when you use a dedicated microphone/preamp input XLR patchbay...or just connect the mics directly to the preamps.