Hi @SuzBling ,
Prospecting means getting new traffic to your store which is most likely to convert into sales when they visit your store.
There are 2 ways of prospecting.
Interest Based -> Target new Audience basis on the interest
Look-a-like Based- Target new audience which is most similar to people which have previously purchased from your store.
If your store has low traffic use interest based, else go with lookalike based.
If you need any other help, just drop a message. More conveniently you can go with Addyz, it comes with all this strategy and can automate your online marketing effort