Do the leaves have symmetrical 'V' teeth all around? Then it's probably an Ulmus parvifolia (Chinese elm). It COULD be a Zelkova serrata which is very hard to distinguish from the elm unless you know what to look for, but both belong outside for life. While the 'S' shape is a standard mass-produced style of 'mall-sai', and not really desirable in serious bonsai, if you like it, it's fine. Now is not the time to be thinking much about styling apart from keeping the foliage mass(es) relatively neat - there's lots of time for shaping later on. Right now you want to concentrate on keeping it alive and well, so go to www.bonsai4me.com for more detail on your very popular type of tree. It's best to water well only when the top ~ 1/2" of the soil is dry but that's relative depending on how big the whole thing is. Really what you want is a gritty, fast draining bonsai mix, and not the (likely) peat based potting soil it probably came in which can yellow leaves, so watering more often won't leave the bottom half of the soil soggy all the time and will allow necessary O2 in there. When you repot, use 1/2 grit (perlite & aquarium gravel all mixed) to 1/2 soil, but a more coarse type with larger particles which a garden center could provide. The tree likes lots of sun, but in TX, especially in summer, you should prop a reflective tile or something against the pot to keep roots from cooking and don't let it otherwise dry out too much. And it is cold hardy to at least 20 F. (tho' much colder) and will be happier being able to go dormant (and possibly lose leaves) in winter when, hopefully, it does get cooler there. Your best learning bet will be a local club, so try to find one so you see how local growers who really know the environment, take care of the trees and can show you how to repot, prune (and when to do it), etc.