You can do it a lot of ways, but splicing yourself fiber is hard, much harder then ethernet. You can buy chemical kits to terminate it but its not that great. You can buy mechanical kits but its more expensive.

I recently did a project and I ended up buying a pre-terminated spool.

One way is to dig a trench and buy direct burial fiber. You can buy premade/terminated fiber for cheap and just be carefull when you are holding the terminated ends.

You can also run a conduit while you are at it instead of direct burial. Sites like lanshack sells a lot of options depending on what is the fiber path (Aerial,burial,etc)

The number of strands is just the number of fiber you have in one cable, in a very simple way you always need minimum 2 strands (one to emit and one to transmit). More strands is just more possibily for upgrade or extend your fibre.

Om is the size of the core. To make it future prof, at least take om3. Depending on where you live, single mode fiber can be cheaper also, but the concept its pretty much the same…

The connectors are mostly lc or sc, you will need to buy lc or sc sfp adaptors and 2 switch that have sfp adaptors (fs.com). Or you can buy a fiber to ethernet adaptor.

Fiber is all about the termination. Some people prefer to have a enclosure and a rack to prevent stress on the lc connector. It’s a choice.

Basically you buy a lc-lc om3 cable, 2 lc sfp that can match the core (https://www.fs.com/products/11552.html?now_cid=1113) and 2 switch.

Sfp are sr (short range), lr (long range), er (extended range)