When you take a balance transfer, you'll move the balance on an existing credit card that's at a high interest rate over to the card with the 0% promotional rate. From that time on, you'll pay no interest for 12 to 18 months, or whatever the time limit on the promotional rate is. Every dollar you pay toward your debt goes to reducing the principal. You'll repay debt much more quickly when you have no interest to pay. 
Debt settlement: This is what National Debt Relief is best at. National Debt Relief has been doing debt settlements for years and knows the ins and outs of the laws around debt settlements. While debt settlement is a good option for people who are drowning in debt, it does have some downsides, including wrecking your credit score. Be sure to know the risks surrounding debt settlement before you start the process. National Debt Relief has all the information you need to know about debt settlement on its website.
However, there are impacts to your credit that don’t affect your score. While on a Debt Management Plan, a client’s credit report will have a notation that he or she is currently enrolled in a Debt Management Plan. While that notation is active, they will not be granted new credit. Plainly, this is an impact to one’s credit that should be considered. But the notation goes away when the Debt Management Plan is complete, and doesn’t have a lasting impact on one’s credit.
As far as options go, I’d recommend you start by talking with a reputable credit counseling agency – one of the options I mentioned in the story. That will give you a baseline to start with. If they can help you with DMP, it’s likely to do the least damage to your credit (with the exception of just paying the debt off) over the long run. If you/they determine a DMP isn’t feasible then you’ll know you have to look at more drastic options like negotiation or bankruptcy.
Do yourself a favor, if you were ripped off like me by National Debt Relief, submit a complaint to ConsumerFinance.Gov. My lawyer counseled me on this. When I called from my job, they did not disclose they were a for profit agency, I had to ask them. They did not tell me the percentage that they would take as profit. I did not learn that until about 3 weeks ago when I demanded to know the profit they took. Their answer after a long time of questioning was they took 25% off the original debt for themselves. When I said that I did not know this. Their response was : “it is in page 3 of the contract.” I could not find this information anywhere nor it was said to me. The representative who enrolled me Berlinda C only said ” We take a small fee” but would not specify the amount. So far, they have taken from me $2,500 and my creditors have hardly seen any money. When a settlement is negotiated, they take everything they have taken from my account for themselves and on top of that charge about $60 monthly extra in order to make the payments to the creditors. I find this sum exorbitant. I now closed my account with them because I have realized the rip off that this company is. I have lost $2,500 for their profit.
A debt management plan sets up a payment schedule for you to repay your debts, with the goal of helping creditors receive the money owed to them and ultimately improving your financial and credit standing. By voluntary agreement, you deposit funds with your credit counseling agency each month, who sends those funds directly to your creditors. It usually takes 3-5 years to complete payments under a debt management program, after which you may be able to reestablish credit.