If boards is showing 

SPADESPADEHEARTHEART ( or whatever 2 colors ) on turn, and we are in 

1-HU pot

2- 3 way pot

What if we have made hand - str8 or set that go bet or check raised and called - HOW to play rivers when 1 color outs

What if we have a draw - what cards do we bluff

This spot is sort of making me problem in play

Any help very appreciated

thank you

xx

PS - also would be appreciated any broader approach to situation ( more villains diff holdings diff outs on rvr etc )