People around me put up signs that say 'Honey' and 'eggs' and even 'Produce' - the 'for sale' is assumed I guess and it may be less in your face if it isn't fully OK to sell.
Mostly they have a stand at the end of their driveway. Often it has a security camera and instructions for paying with Venmo or whatever.
The only problem with that is cell coverage is appalling around me so you often have to go for a little walk in order to be able to pay on line!
I think the cameras probably help encourage good behavior.
Then there are the slightly bigger farms that have a website and certain days you can book to come and buy at the farm gate - that is mainly for meat.
Farm stand tax - beautiful Sylvie is getting progressively darker - I don't think she realizes she has been carrying around a spent feather:
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