Glad to see someone else tinkering with old bikes. I've spent a lot of my life "restoring" or rebuilding old Harleys and pommy bikes.
I got 5 velocettes in various degrees of dissasembly, a '48 Arial single, and most of a 1925 Douglas TS.
I find it really rewarding (and sometimes frustrating

) tinkering with these old things. Nothing like spending an evening down in the shed with a couple of beers a few rusty bike bits and a set of Whitworth spanners
Half the fun is scouring swap meets for that elusive missing part. The feeling when you finally get one started that's been sitting dormant for 40-50 years is almost indescribable.
It's another thing altogethor, when you take them out for a ride. My neighbours gather en mass to watch me wobble around trying to ride one of the '47 velocettes that's got a lever pull handle start up, right hand 3 speed tank shift and the handling of a pregnant whale
All the best with your new hobby - I think you'll have an absolute ball.