My advice would be to aim for the instrument you'd most like to play - there are going to be times when it seems like a real drag, and being able to visualise the finished article will help keep you going. A strat style guitar will be easiest in so far as the templates are readily available and using a front-routed design will give you more margin for error for your first time. If you put a pickguard on the front you can cover any rough edges. Depends what tools you have access to though. A tele shaped guitar would be even easier - one less horn to cut out!

Bear in mind that unless you are very lucky and/or a woodworking genius you're likely to mess up now and again - hopefully only in a minor way. Accept imperfections as part of the instrument's character.

Finally, if you've got a little spare money I'd suggest looking at books by Dan Erlewine, this one for example, and take a trip to www.stewmac.com. It might be worth investing in some of the more specialised tools that the workshop perhaps won't have, and they have templates for pretty much everything.

Good Luck, and be patient - measure twice, cut once.... ;)