It looks like the previous owner swapped in a different engine. The engine that you have (D15B7) is from the 92-95 DX and make 102 hp and 98 tq. As far as makeing more of both, it depends on what your budget, future plans and such are. Most people do the standard boltons first ( I/H/E - intake, header, exhaust ). If you are new to modding, then this is a good place to start. Those three will give you a slight, but noticable increase in power, and are pretty easy to install and are a great way to become more familiar with your car.
Edit:
I forgot to mention this the first time around, but the best way to learn about your car is read what others post here. Search about I/H/E and your questions will be answered.