Firstly well done for wanting to tackle this problem.
Secondly paying off debt is not easy so don’t underestimate how hard this might be.
If you’re really serious about this I have found the best way is to budget properly. It’s a lot of work initially but once it is set up it is fairly easy to maintain.
To do this you need to get a complete idea of your debt by writing down every single person or organisation/company you owe money to, the total balance, and the exact interest rate.
Then you need to consider your monthly income.
Finally you look at bills (like council tax, electricity, gas, insurance, mortgage/rent, etc.) and look at bank statements for how much you spend on groceries, clothes, gifts, eating out, etc. Money Saving Expert has a great spreadsheet which can help you. I use an adapted version of this.
Citizen’s advice may be able to help.
Once you have all this information you can set a budget. Look at things you spend money on that you don’t really need and identify if you can increase your income.
Even thou I am now completely debt free, I still budget and review it monthly.
Good Luck