Invest in a year

I’m thinking about my business model for the first year of my business and I was wondering if there were any keys on deciding how much to invest in your business each year (specifically the break even year)? I understand the idea that the more you invest the more you’ll make. And Brooke talks about this in the 10 year plan, but I’m wondering about the investing part so I can plan out how I’ll invest the money and how much I’ll be investing. Thanks!