Luf's guide is "THE" guide and well proven but I cheaped out when I routed mine and used something like this readily available from the hardware store - It was about $7:
http://www.drywalltips.org/bullnose-cornerbead-arch.htmThe plastic one has holes already in it and I just used some finishing nails in a zig-zag pattern to hold it in place snuggly(a lot-o-nails!). You can trim the hole sections to create more complex curves. It was about 8 ft? long. Worked great but if you want "perfect" straights, you should probably use a straight edge of some sort. I like my straights with slight imperfections, so no problems with it! Plus, once I finished, I used it as the outside wall on my large sweeper curve. Double duty - bonus! :clap:
Once you have one lane, you can either use the guide to make the other lanes (creating free-flowing lane spacing) or create a jig that has a pin/nail/screw in the lane and the router bit set some distance away from it - I've seen pictures of some who used simple peg board and screwed it to the router base.
If you are married and decide to route this thing indoors, you'd better sleep with one eye open :wink: - as MDF dust is incredibly fine, voluminous and unhealthy. Even with a dust catcher hooked up to the shop vac, I laid a layer of dust throughout my garage. (I filled the 3 gallon shop vac canister a couple times).
Also, I'd recommend eye protection and a mask. Outdoors on a nice day is the ticket.....I just routed mine right on the garage floor but next time it's the driveway :doh:
Remember the router should only go in one direction against the guide (I think left to right??) Also, use a solid carbide bit, not a carbide "tip" bit - My 1st carbide tip bit lasted about 7 seconds before it broke and launched at warp speed. The solid bit is more expensive but trust me, well worth it!
http://www.woodmagazine.com/woodworking ... direction/Good luck and don't sweat it! I'd never used a router before either - I went slow, didn't force it and it was a piece of cake. Also, don't worry about slight imperfections in your slots. I found out that once in use, the track is extremely forgiving to wobbles or slight variations and you won't even notice it - Constant depth is the key, so keep the router flat to the board!