Believe it or not, I find a lot of woodworking jig and shop furniture ideas on Pinterest. And since they've picked up on my focused interest in woodworking, they're always sending me updates on boards and pins that are related to woodworking. That being said, some of the most useful jigs for immediate use are:

* Straight-edge and cross-cutting guides for your circular saw: https://www.familyhandyman.com/tools...uides/view-all
* Dado cutting jig (I made a variation on this one, and will be making another one with some experience-driven improvements): Creative Landscape Accents Blog July 25 2009
* If you have a table saw, a cross-cut sled can make things easier and safer: https://www.familyhandyman.com/works...-sled/view-all
* Making simple things to help with assembly like 90 degree corner guides https://atelierdubricoleur.wordpress...or-assembly-2/ or these supports (you can figure out how they would be made without plans - the picture is really good) Adjustable Assembly Supports Woodworking Plan from WOOD Magazine can also make life easier when you only have your own two hands.

But definitely check out pinterest - it provides a good jumping off point to find jig ideas, and then you can always come back to the forums here to discuss approaches for making similar jigs, or how to improve their design.

Hope that helps,
Greg