Can I get a house mortgage for what it is appraised for?

Please Please go easy on me, I am hoping to be a first time house owner.

Two Questions:
1) If a house you are buying is appraised for $ 30,000 and you are buying the house for $ 20,000. Can you get a loan (mortgage) for $ 30,000 (so I can take the extra $ 10,000 to fix up the place)?

2) What would be one advice would you give a 1st time home buyer, that YOU wished you knew when buying a house.

Thank you!

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