Without many nutes

Can I just use calmag the whole time during my veg stage, and my home made banana peel and sugar nute for flowering stage will that be enough for nutes

You going to need some quality nutes. The plants can't live on air alone. If you have a few bucks to spare (like three) check out Greenleaf Nutrients. They giving away samples for the cost of shipping. But you going to have to use something besides sugar water.

If you get bout 20 bucks go to the plant nursery n get Jack's classics 20-20-20 all purpose you can run that all the way thru has everything u need besides calmag