1. Define one problem
Write down who the user is and the single problem you solve. If you cannot explain it in two sentences, the scope is too big.
2. List the smallest useful feature set
Separate must-haves from nice-to-haves. An MVP usually needs sign up, one core workflow, a simple dashboard and a way to pay or request access.
3. Choose a simple stack and launch plan
Pick technology your team can maintain. Plan hosting, payments, analytics and a way to collect user feedback from day one.
4. Launch, learn and iterate
Release to a small group, watch how they use it, and improve based on real behavior. This is cheaper and safer than building everything upfront.