If you feel like you don't have the material, it would bet better to do it monthly or bi-monthly than weekly.
I listen to Hello Internet and sometimes the Cortex podcast. I don't use soundcloud or any of the other podcast distribution tools. I just listen to it on youtube. It's like an hour long podcast with some looping 6 second animation on it. Being on youtube makes it easier for me to get to.
A lot of the successful ones are thoughtful, educated guys talking about stuff inspired by their real life. So if you're going through life, and you end up making a change on your motorcycle, talk about the change, and how it's better than stock, what you considered, and what you ended up doing.
You do trackday instruction. Talk about what you see when people show up first time. Talk about ways to be prepared for a trackday. Common things people overlook. Do an episode on 'getting stuck' with how people run into different barriers and techniques to 1. recognize and 2. overcome those barriers.
You are excited about a new product. Why are you excited? How will this change the industry or competing products? Why should I be excited? What are the metrics for the new product's success?
You set up your garage a certain way. Why? What's cool about your workspace?
You only race in one competition? Multiple competitions? Explain amateur racing to me. Explain CCS v CMRA v OMRA and how they overlap. Do victories at some places count towards multiple series? Explain MotoAmerica to me.
You never ride street? How do stay connected to the two wheel life on non-track days? I commute every day I can and it's wonderful. I couldn't imagine not riding. I want an adventure bike. Maybe you decide to get a VStrom with bags or a Versys with bags and go out on a few rides. Tell people what you learned. Do you still hate street riding after?
Never ride faster than you can stop