On MFT Micro Four Third cameras like yours, let's say Olympus Pen and Panasonic G series, you can use Olympus lenses, Panasonic lenses as well as Sigma DN lenses, some Voigtländer (non AF lenses) or you can just find an adapter to use old manual focus lenses.
Then you can use a zoom lens or use a fixed focal lens. I mainly do not use zooms, I prefer fixed focal lenses. I am sure you can find a cheap Olympus or Panasonic lens like a 14-45 or you can choose the SIgma DN lenses (19mm f2.8 and 30mmF2.
that are very good and very cheap. They both cost under 200€ each.
My first lens with my GX1 was the Panasonic 14 mm, then the Sigma 19, then the Sigma 30. Next one will be the Olympus 45.
The best you can do in go to a camera store and try the lenses availlable.
Then to lurn photography I suppose there are many tutorials online, then you can visit the local library where you might find the books you need.
With kind regards