[Gretl-users] help with panel data

Hello gretl users:) I am asking for some help with panel data. It's the first time that I'm working with this type of data. So I'm not fully aware of the steps I should make. I don't know what should I do before proceeding to the fixed effects test. What tests should I use for Heteroskedasticity, Autocorrelation and serrial correlation for panel data? What other test should I make? I will be very grateful for any hints:) Karolina