THe best tuts that I have seen on the net were created by Dragonsong. He has since stopped making tuts, but they are still the best around. It can be a little hard to get to them (the site is no longer maintained) but here is a link through RPGplanet:
http://www.rpgplanet.com/morrowind/tamriel...tuts/First.htmlThere are several basic building tuts, a landscape one and maybe one other one. In my opinion the best thing to do is read through them, follow the directions until you feel confident in the TESCS and then strike out on your own. Good luck!