"The development to reach an alpha version, working product, can take a few weeks to couple of months.
I do have a day job - and wish to keep it.
so I can work only at the weekends for this project."

Part time involvement does not interest most people. Its just not serious enough to have a day job, and 'develop' part time, and ask people to fund said development.
In Dragons Den, you will be laughed at if asking for investment funds, and tell the panel you intend to keep you're day job.