New to twinking, any recommended reads?

Everything you need is right here - https://xpoff.com/threads/20s-guide-index-and-faq-read-before-posting-new-threads.95324/

General gear guide here - https://twinkdb.github.io/

 

if you have an active sub still, roll a farming toon, level 24-25, & join some farms for ilvl28 BoE's to grab that sweet ( & very expensive ) gem-socketed leech gear... imo, you might want to look for some speed gear too. The guide & DB above are the go-to sources of info, so peruse them to your content. Also, jump in one of the communities. Folks are generally very helpful, at worst redirecting you to the above sources of intel. Lastly https://xpoff.com/threads/f2p-vet-armory-list.266/ can give you a look at some Ret builds you may want to draw inspiration from.
And... Welcome! Always great to have someone else interested in the charming joy of twinking.