Hi there.
I.. like others have started again after having the guitar hanging on the Wall for 20 years.
I realy just wanted to be able to improvise some blues over a backing track at first or put on an AC/DC album and jam along.
Then I learned the pentatonic scale, minor and major scale, intervals and CAGED system, playing by numbers etc.. and now things and ideas kind of flows more natural and I feel more confidant.
During the time learning this theory however I felt the opposite of confident.
But if you know what you want to learn there is so mutch resourse on GT to learn from.
I learn from different sources since I find some put more focus on what I am learning.
Like Joseph Alexander who has some realy great books on blues for ex.
The CAGED system combined with the petatonic scale and visualising chords in major/minor scale took me 4 different books to get the hang of.
It all is alot to learn but for me it is a long term hobby and development and Im so glad there will always be things to learn along the way.
when theory gets to overwhelming I just play some easy songs by the clash or whatever to shake things of abit then start again.
The most important thing is to do it all with joy.