HELP!!!!!!!! I have birds eggs! What do I do?

While I was outside..I live in SC. I witnessed a mocking bird try to snatch eggs out of a little nest on my porch.. I scared it off but it dropped two eggs into my bushes..they never hit the ground and they were still warm...I try to put them pack in the nest but the Mama started attacking me..I brought them and went to Petsmart got a lil tank and a light to keep them warm... I don't know what kind they r but they are tiny (cream colored with brown spots all over) ...any suggestions? I want to say the mama laid the eggs like 3wks ago... any advice will help me!