Welcome to the forum you will find lots of expertise and ideas and help here.
I'm sure lots of us start into G scale not intending to do much with it, but it grows on you! However, because of old age and its effects and space, I am limited in what I can do, but it's surprising how much you can get into a 7 foot by 5 foot space. Depending on how you approach things, train lengths are limited to two or three pieces of rolling stock, but there is still fun in this and relaxation just watching the train go by.