Hey Dashy!! Welcome to this awesome catsite :3
I'm also a former FeralFronter, though I stuck mainly around Ext. WindClan, BlizzardClan, SR, and in the site's dying days, the Cartel. I also play the deputy of ShadowClan, Smogmaw, so if you have any questions about that place in particular, feel free to hmu on Disc!! (my user is @lowlands)
As for tips/advice, the library/guides board is a great font of knowledge for all things TT. there's a bunch of threads that have portion's of the site's history, such as a
general history thread, as well as a semi-outdated one for
shadowclan!. shadowclan also has a document in its discord server that has a bunch of recent events listed so newcomers there aren't
too far out of the loop.
and finally, in the main discord, there's a channel dedicated to asking questions about the site (it's the best place to find out whether a name is legal or not lol).
can't wait to see you around!