How much money do you need to start Coinbase?

Excuse me, I'm just getting started in the cryptocurrency world and I've heard of Coinbase as a popular platform. Could you tell me how much money do I actually need to start using Coinbase? I'm not quite sure if there's a minimum deposit requirement or if I can start small and gradually build up. Also, I'd like to know if there are any additional costs or fees involved in getting started. I'm trying to budget my initial investment, so your insights would be really helpful.