Welcome.
Chain cleaning threads are like oil threads. Everyone's got a different opinion.
I got into the habit of using Chain Wax on my Speedmaster once a week. You can probably get away with going 500-1000 miles but it's easy enough to do.
The BA with a carb is a cold-blooded beast. However, it only takes some choking after a cold start and within a few minutes/miles it'll be warmed up.
Good luck & ride safe.
