Starting from 0 in April, it has taken 5 months to settle into settings that suit my photo needs and style. I posed the same question here in late spring, and if you do a search on the forum you'll find the long string of responses I got. Many from people far more knowledgeable than I.
Let me summarize what a few said. U1 for action (sports, romping kids, pets). U2 for indoor stuff. My take is quite different. U1 for social/family, U2 for product shots.
With neat categories like that, the first thing you'd set is JPEG or RAW to save files. Then AF type. AF-C for things in motion, AF-S for still subjects. Then set the Metering Mode you prefer. Along with that, your backup gun (you know, the revolver hidden in your sock) is MY Menu, where you pack shortcuts to all the stuff you need quickly. Mine is loaded with Built-In Flash settings, Battery Monitor, Artificial Horizon.
U1 and U2 each allow a differing arrangement for MY MENU. As time passed and I got weary of setting menus, I learned about the architecture of the D7000, and how it provides 'back doors' and 'short cuts'. A big one is the INFO button on the lower right side of the camera back. Hit the button once and you get an enlarged LCD display of the Control Panel on top, combined with things depicted in the Viewfinder. f-stop, Shutter, ISO, Focus Mode, Metering Mode and lots more.
But then......... hit the Info button a 2nd time and there are avenues that burrow deep into menus for setting the Fn button, Preview button, Picture Contol (vivid etc), AF selections, noise and distortion correction and a few more.
In short, I would suggest that you consider learning all the controls on the camera, before spending and inordinate amount of time stacking preferences into U1/U2 and Saved Settings. The latter is a 3rd collection of preferences governing how the camera reacts in the PASM modes.
I'm sure others will chime in on these subjects. But first take a look at previous postings on the same issue.