I am working on a project (a sorta marketplace) and I am all by myself. I am a programmer and have built the product from scratch and it's gonna be finished in 2-3 months.

I am confused a lot by non-programming aspect of the startup. Marketing is not my domain and I want to learn how to bring right users to my product.

Some of the questions I have are: 1. Should I work on marketing strategies while I am working on product? 2. After the product is ready, how can I start bringing the right users? Where should I start with? Should I start with advertising? 3. Right now I am paying for everything but where can I find investors or someone who would be interested in paying development cost for a part ownership? 4. I am working on website only for now and in the future I have planned to create apps for the project. Should I work on app and website together then launch or just focus on making the product ready?

I am not familiar with any professional terms used by Entrepreneur as I am very new to this but please feel free to guide me toward stuff which might be helpful for beginners.

Thank you!