While the greater majority of us will not be able to use radio or tv in the early stages, there is no reason why we could not reach out using this media once we are well established.
As radio is a lot cheaper than tv advertising this is where we should start. More people are listening to the radio via the internet these days so there are not the location restrictions that used to apply with radio.
A short radio ad could make you a lot of money if the right people are listening. You will just have to weigh up the cost of the ad against the expected return from sales.
I am mentioning the radio and TV just to remind you they are available if you have a product that could prove to be a market leader.