whats up evryone. I hope all is well

I have a very pretty lugged 531 frame falcon road bike that I canabilized to build up my cross check commuter.

long story short My cross check is now all new components SO I can put the Blue falcon back together
again.

I was thinking a SS would be great for quick fun rides ...

My wheels are campy rims with 7 speed 105 hubs so I will use spacers and a cog, that said I have some other questions If you would all be so kind.

1) I have a 105 crank 52/39 what ring would be better to use? I hear 42 is the norm but I dont have one. If I have to Ill get 42 but if I can use the 52 or 39 that would be nice. inside or outside ring better?? Need stack bolts ...??

2) its pretty hilly around my part of town so what is a good cog for rear (depending on crank of course)

3) The blue falcon has horizontal drop outs would I still need a tenioner ? or is it easier to have one??

4) Bars: I have a set of drops but noticed MANY SS and fixie folks prefer moustache or Bull horns
any advantage with SS in mind or are drops fine?

thats it for now the bike should go together pretty quick once I have a few particulars worked out.

many thanks

"John"