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Obviously, you will need a pottery kiln to fire the pots in....:)

You will need to do a few test firings. Usually you can bisque fire at 1000 degrees centigrade. Most clays are still porous after firing at this temperature and you can paint a glaze onto them and fire them again to melt the glaze. Some clay, like terracotta is glost fired at around 1100 to 1200 deg...

Sorry, didn't mean to sound defeatist :) The orange clay is probably terracotta :) just make it into a slip by adding water, then sieve it to get rid of the worms stones and twigs, dry it out on a plaster slab till its plastic again, and then you can use it after you have wedged and kneaded it to ge...

Do you know how to process the clay JT101? Its a lot of hard work. Valentine Clays are good in Stoke on Trent http://www.valentineclays.co.uk
I don't think it matters what colour the clay is, the important thing is to find out what temperature it needs to be fired at :)