From what you wrote, it sounds as though what you're struggling with has more to do with developing the motivation to "get going" rather than having so much to do you don't know where to begin (overwhelm). However, since I wasn't certain... here are links to 4 articles, from PsychCentral's archives, on the subject of how to get motivated and 4 on what to do when you feel overwhelmed. The first article is by our host, Dr. John Grohol, Psy.D.:

Am I Depressed or Just Lazy?

Tips for Finding Motivation When You're Depressed

5 Steps to Increase Motivation

10 Ways To Find New Motivation

The Cure for Feeling Overwhelmed | Happily Imperfect

https://psychcentral.com/blog/overwh...gies-may-help/

https://psychcentral.com/blog/feelin...that-may-help/

https://blogs.psychcentral.com/weigh...g-overwhelmed/