So meeting this girl I met online for the first time at hers she's cooking I'm bring drinks any first days do's and don'ts
Do be yourself and just go with the flow
Don't do "the naked man", it has a very low success rate (refer to "How I met your mother" if you don't know what the naked man is)
Do offer to help with the cooking as directed, and for sure the cleanup
Don't compare the cooking to any other place or persons.
Don't drink too much, bring dessert and flowers maybe.
See if she has any food allergies I guess too.
Don't expect anything more than enjoyable company.
Don't push her into anything - she wants a kiss or snuggle, she'll let you know.
Do help with the setup/cleanup - offer to help with the cooking.
Do find out what her interests are - books, movies, etc - to set up a second date.
Do take an interest in her as a person, not a bed-mate.
Don't be on your phone constantly, in fact only get your phone out for a cab or an actual emergency. Thought I'd put something that probably applies to younger couples.