If I only get one tip, I will re-state a recurring statement: Don't overpack. The most important items to take are ones that you can't get on the road.... glasses, prescriptions, CC's/ID, etc. I now take about 1/3 of the clothing than when I started. I also suffer from "food insecurity," and had to parse down my groceries over time also.
Honorable mentions:
Test ride the bike with the load you intend to carry for a considerable distance to ensure gearing is low enough, and that the bike is stable.
Keep the distance reasonable until you get a feel for touring. It is far better to get to camp thinking I could have easily done more, than to get there dogged-dizzy-tired and/or injured.