Paster,
Forgot to add in some other things in my last post.
Once you decide on a location, stand alone track, track with a shop, size of track area and type and scale of racing you wish to do, indoor or outdoor, or both. Having a solid plan for the design of the facility and a budget that can allow for that would be ideal.
After that, piping? There are a number of ways to do it. One of the best is the very high dollar PVC covered currogated. Not sure what it's exactly called, but I've usually only seen in come in two colors. White and Yellow seems to be the most common. The Yellow is more expensive for some reason. 3 to 4 inch dia. seems to be about the right size. The usual black drainage pipe is pretty cheap, but doesn't always last as long. The steaks to hold the pipe down also cost a fair amount and you'll use a lot more than you'd think.
Rope like was mentioned will work and is pretty easy to work with. I also seen some fire hose filled with dirt or sand used. Works ok, but get a hole in it and it could be a pain to fix let alone the dirt/sand on the track surface. For sure a lot of things that will get the job done. Biggest issue is budget.
Insurance for the track. A couple of ways to cover that. Either have everyone sign up for a ROAR member ship and use the insurance they provide. Some people have issues with that. It's also an added cost for racers. Granted it's only 25-35 a year, but it's a cost that new racers don't always want to spend. A second option is to go and get your own insurance coverage. I think the local outdoor track found a plan for 500 a year for 1 mill's worth of coverage. You might need more depending on your area. Its a cost for the track to absorb, but shouldn't brake the bank either over the course of a season.
Lap counting. the AMB systems is what get's used. I think there a few different generations to pick from. Get the newest gen you can afford. Price range is about 2000-3500 I think. You'll also need to determin wether or not you'll need house transponders. Some tracks have strayed away from them and went PT's mandatory. There were/are issues with getting the house transponders repaired/replaced cheaply and one of the newer gen of the AMB system didn't like them if I remember right.
Scoring software. There's a few different ones to use. A few that are free and then the one most tracks use a version of. RCscoring Pro is the most used. It's one of the best out there, but it's also pretty expensive to buy your own copy. You could always barrow a copy or? Well, there's ways around paying for things, but you could run into issues. There's a few different versions of scoring pro to pick from and you should be able to get the softwear you need. getting the one that allows you to have 12-15 car mains could be helpful if it's needed.