a few suggestions..............
Here is a web site that may interest you. Kenrockwell.com
It covers a wide range of camera issues. Ken is a Film and Nikon fanatic. He is very opinionated ( in a good way ) but backs it up with a lot of technical knowledge.
The OM 1 in its day was a top of the line camera. I am sure wikipedia has something on it.
What lens to carry? I would suggest a wide angle ( that would be something lower then 50 mm, hopefully you have a 28 mm ).
Remember the sunny sixteen rule. On a sunny day, set your camera iso for the speed of the film you purchased ( suggest fuji print film iso 100 ), apeture for f 16 and the shutter speed close to the iso of the film ( 1 / 125 ). This, in most cases, will give you the correct exposure. Try it and check the light meter on the camera.
Go to the library and get a good basic photography book published pre 1980. That should give you the basics of film photography which is a strong foundation for digital photography. Any book authored by ansel adams is also a good place to start.
Leaning film photography is not that expensive when you consider that you can pick up a 1000 dollar film nikon for about 75 bucks ( Nikon N 90s ) that can give you a bit better picture then a digital D700 nikon that runs 3000 dollars.
Have fun, the OM 1 is a very nice camera. Just remember that if it breaks or needs repair, its cheaper to pick another used one then to try and get it fixed. So my point being is not to get too attached to the camera itself. Its the person behind the camera that makes the difference.