What was the NHL like back then? (1920s – 1930s)

Grew up a hockey fan, lived my life around the sport, played a few years, but the professional league from almost 100 years ago has me curious. Did these men play hockey as a full time job? It looks a little more casual than today's hockey. How and why was it filmed if modern sports broadcasting seems to begin in the 1950s? I'm guessing most listened to games on the radio. Who went to the games? The stands look pretty loaded. Were tickets cheap, or only something the upper class would go check out? The ice looks pretty rough, did they clear it at all during the game or just before and after? Did they bus between the original 6 cities or actually fly? How many games did they play a year? Obviously there's major equipment improvements but do you have a fun fact about old school hockey gear? I'm in a learning mood tonight, so tell me all you can.