new mommy advice

So I've been with my boyfriend for a little over a month now... And I just found out from him last week that he has a 2 almost 3 year old daughter at the age of 17... 
I've already accepted the role of being her mom, because her really mother isn't with us any longer, but I'm terrified... I have no clue how to be a mother... Can anyone talk to 
me and give me some advice? 

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