A question about G-power analysis, could anyone help me to figure out the sample size of my study through G-power?

#1
Hi, everyone, I am doing a non probability sampling research. As you can see in the attached conceptual model, I am doing a study with 4 main variables with each link to one another. I guess I am going to do my study with regression analysis because all my variables are interval measurement. Here I attached the G power analysis layout, but I don't know what are the predictors and effect size in the G-power analysis for my study. Could you guy lend me a helping hand?
 

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