Getting Started - No Jobs, No Community Lots, No Rabbit Holes
Well, look at it this way: You're sending your sims out to look for work after bulldozing every local business in the city! Of course they aren't going to be able to find jobs!
In all seriousness, in your effort to start from scratch, it sounds like you deleted the very rabbit holes you're looking for.
Realistically, you have two options to fix this. The first is to simply start over, and be a little less judicious with what lots you bulldoze.
Alternatively, if you create a second Sunset Valley file, you can go into edit neighborhood mode and "Save to Bin" the rabbit hole lots you need. Since the bin exists across neighborhoods, you will then be able to plop down whatever missing rabbit holes you need.
You can replace the missing rabbit holes without having to copy them to the bin from other neighborhoods. If you go into build mode, there is a button that looks kind of like a small store front. in there you will find prebuilt rabbithole buildings. You can just place one you want them to work at for now if you want.
If you are really ambitious though, you can download rabbit hole replacement rugs or doors ( http://modthesims.info/d/435107 ) and use them to build your own building. Just make sure you read the placement restrictions, otherwise they won't work.