Hello,
can the main image show as default first? only after choose the variant it will change according to variants image?
Of course, the solution would be to go to your product's variant configuration page and add the same image as in the main product and correctly order them, so that it will show the "main" image first.
there is no button "PLEASE SELECT" at variants options. no matter what product will show the default variant options
Can you give us more information about it through some screenshots for example so that we can understand your issue and correctly advise you.
Kind regards,
Mohamed.