I am the same and tend to destroy shelves from loading them down. Wife said she is planning on filling crates to put on the shelves which is actually going to work well as it will spread the weight out better. I had to put support blocks on the shelves I built in the boy's room as I was a doofus and forgot about the grain of plywood so the shelves sag easily without them.
I had to think a bit about the brackets since there is a 1.5" difference between the walls and the shelves and I didn't want to have a gap between them and the wall.
Storage, shelving, and organizational cubbies are some of the best things to build in a house. I love me a good set of shelves!