I think most will say to figure out what you will be building and make sure you have a good work flow, so that you aren't running around the shop for the next operation each time. Find the Sketchup tutorials that Dave Richards has done here, and down load the free Google Sketchup program. There's a bit of a learning curve, which I haven't done yet, but if you are in the planning stages, it's the time to learn. There are also downloads for machines to use as templates.
Other than that, Grizzly has an online floorplan builder (2-D) and Delta used to. Surely they still have it on the new combined Delta-Porter Cable site. Play around with different options, and mentally walk through the items you know you will be building to see if the flow is workable.
I bought a 3-D house program by Punch! that I did mine in. Got it 5 years ago or so when I thought I was going to get to build a house to my specs, not buy one that was good that would work.
Also look through the shop tours section, and some of the construction threads (mine has my floor plan there since my shop is still a work in progress). You'll get some ideas from those. Speaking of which, I have 2 torsion boxes calling to me to sand on. Good luck and show us your progress along the way. Woodworkers here are always good to point out if there is a better way of doing something, then you can decide if it is better for you or not. Always some good ideas that provoke other ideas. Jim.
Home of Irish Setter Rescue of North Texas
When Irish Eyes are smiling, they're usually up to something!!
At a minimum, I'm Pentatoxic...but most likely, I'm a Pentaholic. There seems to be no known cure. Pentatonix, winners of The Sing Off, season 3