"Flies are like 22 bullets, expendable"
Well, I'd like to disagree with that one
I find that they are more like arrows - the well made ones last a long time once you pull them out of the target and use them again. On that recent trip to Assynt I had one fly take over thirty fish and another almost twenty before one of them wore out. If you make the arrow well then all will be good. The trick is to make the arrow well.
Glasses - well I HAVE to wear them so I'm biased. Yes you should because they make you look cool and mysterious and impervious to wayward bad casts. Well not impervious but at least you're wearing protection.... And always have a good hat. Sartorial elegance AND shade = vital!
Size is NOT important - location, mates, fun, state of mind, enjoyment and grin factor are what counts.
Cast length - average is difficult to describe. There are guys on here can put NASA out of a job, but you just really need to learn how to cast to where the fish are. If at first you can't reach them, cast, cast and cast again. Practice...
It does take a while to learn so stick with it. And learn how to cast short and delicate too, it comes in handy.
Fascinating? Oh man, wait till you try this for forty years. Fascinating is so not the word!!!
Just have fun with the whole thing and don't get too absorbed in the whole technical thing. Find what works for you, find where you need to go to get what works for you, working and work at it.
In a fun way