Fiber - multimode vs singlemode?

Hi,

We ran Remee fiber - It is 6 strand, 50 micron.

Remee - 11-006-12S-AANOOF 11-006-12S-AANOOF 6 Fiber OM3, Indoor/Outdoor Riser Rated Type Buffer.

This was run in 2012 - we never terminated it and am getting ready to start using it.

To confirm with a multimode fiber, one fiber is for TX & one is RX?

So with a 6 strand fiber, we would have 3 usable connections for our SFP on a cisco switch?

Also - this fiber is limited to 1GB (is this correct)?

The fiber was pulled with a number of Cat6, Coax, etc so pulling another fiber cable between buildings might not be workable without repulling the entire bundle.

Any information would be great.

Thanks, Rich