interested in real estate investing

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I am hoping to receive some advice here, thank you in advance. I am interested in real estate investing and renting out properties, I have a lot of questions, here are a few:

would a certain degree be helpful?
would you recommend a seperate phone line for a home office?
Any home office advice/tips?
is there a certain job I should go after to begin with?
Would you recommend getting a P.O. Box?
Would you recommend business cards?

I would like this to be a source of income for me, any advice and or tips are again greatly appreciated.

Thank You
Merrie