How much money do I need to invest in Forex trading to start? What is the minimum and the optimum?

It is possible to open an account for as little as 10 units of currency. While brokers do allow this, it is not recommended. It is difficult to practice good trading habits like proper money and trade management with this small amount. You would need significant leverage even to open one trade. And this one investment would consume your entire $10 (or EUR or whatever). To provide more flexibility to practice good trading habits, it is recommended to deposit at least 5,000 units of currency