Welcome to the fray dude.

UtiliKilts / Pittsburgh Kilts / Freedom Kilts / AmeriKilts all offer a nice, plain fabric kilt that will serve you well. Easy to purchase and easy to afford. There are less espensive ones out there, but you'll get some good wear out of these. The fabrics and the construction are all a safe bet. Make sure to ask the vendors questions... as that will let you know how serious they are about the business.

I split kilt-wearing between tartans and solids. You'll find your preference in time. Don't rush into anything until you see something that REALLY strikes your fancy. You might even hit a Celtic Festival or Renn Faire to see what's out there. Most kilt-wearers are MORE than happy to discuss their kiltmaker, and give you and HONEST opinion on the service, price and quality.