Although a debt settlement company may be able to settle one or more of your debts, these programs can be very risky and have serious negative financial consequences for consumers. Additionally, some debt settlement companies deceive consumers by making promises they do not keep and engaging in other illegal conduct (like charging fees before obtaining any settlements, in violation of the TSR). For information, read Coping with Debt and Settling Credit Card Debts.
You'd make the minimum payments on all debts, and pay as much extra as possible toward the $1,000 credit card balance. Once that was paid off, the new "minimum" payment for the card with the $3,000 balance would be $400 (the original $300 minimum plus the $100 minimum you used to make on the card you paid off). Extra cash would also go to repay that card. Finally, once both of those were paid off, you'd focus all your attention on the personal loan. The new "minimum" payment would be $650 ($300 + $250 + $100).
If you decide to start a debt management plan, there will likely be a one time set-up charge and a monthly fee for the cost of administering the plan. These fees are determined in part by your state of residence and will be calculated by your counselor during your credit counseling session. If you feel that a fee will be too much of a burden for you to pay, talk to your counselor. If you qualify under the U.S. Department of Health and Human Services poverty guidelines, you may be eligible to a fee waiver.