If you sell products already off-line or you want to start from scratch and sell products online. There's a few easy ways of going about this that will not cost you much time or money. One of the most important things you always are going to have to do is advertise. It does not matter if you're sitting in a crowded room with 10,000 people. If you do not advertise and tell them what you're selling, chances are no one going to buy anything off of you let alone ask questions are being interested.
A lot of people think that just because everyone knows or should know what a toaster is that this means you do not have to advertise it. This is not true at all. If anything your going to have advertise it and talk about it more because almost everyone knows what one is or owns one. What's so special about yours? On the other hand if you're selling a mini mudgamagmental maker your also going to have to work hard to advertise it because no one knows what a mini mudgamagmental maker is!
Make sure you build an empire so to speak. Sell something that will actually sell. Make a website. Make it interesting. You can sell products from your website, or try selling it on sites such as eBay or Amazon. You can easily sell your products on these sites for certain amount of money and spend a few bucks for ads plus fees. If you spend even $ 100 advertising that product once a month and you make $ 10,000 by doing so, then that hundred dollars will feel like chump change. It will not even matter. So take that into consideration as well, your advertising fees and your profit. On the other hand if you're spending $ 100 and making zero dollars. Its not failure. Its trial and error. Do not give up! Instead tweak the ad or the price a little bit.
Check out the local market. See what everyone else is selling their product for, try an eBay research keyword tool to see what your competitor is using for keywords. Search on other sites and other companies to see how much your product is selling for, how much are they charging for shipping and halding, are they including pictures? Does their advertising shpeel sound so good, you want to buy the same product they are selling? These are the things your going to have to look into if you want to sell your product online and be successful at it.