You don't need money to start, but you do need consistency. Most people quit before they see results.

I'd start by choosing a niche before selecting a network.

This sounds like a great opportunity, especially for someone looking to grow with a startup. Please share more details.

"With mostly US traffic, I'd concentrate on higher-value monetization instead of maximizing ad quantity." Tier 1 audiences often have stronger earning potential when the monetization fits the niche.