How do I go about filing for bankruptcy, are there fees, and what are the pros and cons?

I am on limited income (Social Security Disability) and am in debt due to the actions of a former “friend” of mine. I am considering filing for bankruptcy to get the creditors off my back, and to start over fresh after a certain period of time has gone by (not sure how long that is; I’ve heard 7 years.) I am a responsible person when it comes to paying my bills on time, and the only reason why I’m in debt right now, is because I had trust in the wrong person.
Can you please tell me what process is involved in filing for bankruptcy, if there are any costs (are people who are on limited income, exempt from any fees), and what some pros and cons there are in filing for bankruptcy. Please be as specific as you can. Thank you.

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