Getting back into the hobby and have a few questions

[SportsStar21]

Hey everyone, its been ages since i've been active on this forum

need help with a few details to get me back into things.

Any new rules I should be abidding too?

Is the standard still to use bubble mailer/toploader/sleeve when sending out trades/sales?

What size bubble mailer do you all use now?

and out of curiosity, what are the prices now to ship within canada and canada to USA

thanks for your help
Jonathan