AM is correct. Understand that there is a learning curve with this hobby. You are not going to get big yields right out of the gate. Also, if you want big yields, I would be looking at photoperiod plants and not autos. If you want big yields, you are going to have to have more light. A 600W in a 1.25m x 1.25m space is just at minimum acceptable lighting.
But like AM said, concentrate on learning all you can--there is a ton of reading material out there. Don't believe all you see on You Tube--a lot of it is not true or real. Set your space up well, get it dialed in to correct temps and RH. Read about soil mixtures and nutrients. Learn the life cycle of the plant and what to expect at each phase. The more you know and are able to utilize it, the better grower you will be.