I’m running internet to an out building 550’ from the main house. I’m going to trench an run conduit with pull strings and fiber. Do I just get regular multi it mode with sfp+ connectors on either end? Will my normal 10g switches be fine? Anything else I need to think about?
Then I’d use bidi SFP modules on each side. BiDi uses a single fiber strand for both transmit and receive. This will give you a spare fiber to use later for a second connection or if one of the strands were to break you could use the other one. You need one of each of these modules
I'd go for single mode, since it's usually the same price, if not cheaper.
You'll probably need a fiber splicing machine (and a couple or four splice protectors, depending if you use single fiber or duplex) and a splice box on both ends.