Airwolf YFR066 Headset and Stem

[KermitVonHenderson]

Long time stalker first time poster

After some help as I'm going round in circles trying to figure out what will work.

Got a YFR066 frame I want to put a good headset and stem on it I want a Vision or FSA NS SMR stem, I'm running 1x11 ultegra mechanical so don't want the gears going through the stem to avoid the tightest bends.

Stem seems simple, trying to work out what headset I need to go with that seems impossible. I can just order and try and return but thought I'd see if anyone has any experience on this frame and stem combo.

Side questions whilst I'm here

BB, I see token or Praxis T47 seem decent options from Shimano cranks any other thoughts?

Seat post, the gap between the post and frame seems pretty big and it didn't come with a rubber seal or anything. Are there any generic ones that work?

Thanks in advance
Cam