I would suggest you not buy a "set." Go to a hobby shop (hopefull there is a good one reasonably close) and have the people there show you quality locomotives, power packs and track and then build your own set. Most prepackaged sets don't have good products throughout. Buy the largest radius curve track that will fit in your space. Start simple so that you don't get overwhelmed and frustrated. Expand at your own pace (and budget.)
Read as much as you can.
Good luck
Read as much as you can.
Good luck