I'm working on getting a single speed together but first I have a few questions. I'm building it all of out parts from the co-op here unless there's something that they dont have.

Should I use a freewheel or cassette rear hub? I was thinking that cassette would be better because all that I have to do is slide on the cog size I want and then its all set. Am I thinking about this right? If I use a freewheel then I would need to buy a single speed sprocket, so that's why I was thinking cassette.

I shouldnt need any sort of chain tensioner as the frame that I will be using has horizontal dropouts, right?

Is there any other advice or important things that I'm missing?

Thank You!!