1. Creating an application has never being a problem. The problem is creating a successful business that can scale. Before custom application development for their startups, which later became multimillion-dollar SaaS companies, these founders used MVP approach for SaaS. https://belitsoft.com/custom-application-development-services/successful-saas-startups-mvp-lean-paying-customers-first
2. You are not a developer, so you should hire developers. How Much Does A Custom Software Development Cost?
Do you have an idea of a web startup? Developers will start with User Stories gathering. Alongside, they will start to create the software requirement specification that will be based on User Stories but has all necessary details for the programmers. Simultaneously with it, they will start programming. https://belitsoft.com/custom-application-development-services/how-calculate-real-cost-building-your-web-mobile-startup
Any questions?