Sell what you're selling now and put it online. If you already have a business, you will need a website that can accept payments. Even if its just to pay their bills online, it's well worth it. You don't have to wait for your money.
The best products to sell online are products that you can make yourself. If you can make a product that no one else can, then you have a recipe for success online. Even if its the similar product, your product is unique because it is made by you. Your online business will be unique to local neighborhoods so we can serve and target the local residents in the area. Your target market does not have to be the whole world, just your local neighborhoods.
I would not recommend selling a product that is manufactured and mass-produced by someone else because you will only end up being one of many hundreds (or thousands) of sellers online doing and selling the same thing. You will waste a lot of time and money and you won't reap any short or long-term benefits.