Unless you have a significant budget to hire some people or a company to develop this with you, I strongly suggest finding an existing application like those you mentioned that will be good enough for now. When you make your first million, then look at a custom solution. :-)
Obviously, Outsystems can be used for almost anything but writing one yourself will be a frustrating task for someone with limited software development skills.
Hope this helps,
Curt
Obviously, Outsystems can be used for almost anything but writing one yourself will be a frustrating task for someone with limited software development skills.
Hope this helps,
Curt