no sealants on the gaskets. same for the fittings. should be a flared fuel fitting. no sealant necessary but a little dab of liquid sealer wouldn't hurt as long as it doesn't get inside the line
If you don't have a sheet detailing how to adjust your choke, idle mixture and speed let us know.
Those are different for each engine, though a well build carb may be right on the settings or darn close.