For a B2C product, one of the most important metrics is retention.
For a SaaS product, one of the most important metrics is MRR.
The best way to build experience here is to follow my SaaS launch playbook in the other blog post.
With a consumer app, getting your first $100 to $1000 is going to be much harder. Recognise the audience you are selling to and whether they will actually pay for what you're building and have the pockets to do so.
Go through the popular YC "How to Start a Startup" YouTube playlist.
