Just a note book and pen.
The key is to writing down every single detail...of the money you spend.
So the day you get paid, write down ALL outgoing expenses.
Rent - food - petrol - gas - electricity - phone - mobile - all other bills.
Even what you would spend for lunch at your work, to how many cups of coffee you may buy.That bar of chocolate? write that down.
Keep a record each time you pay for something.Then after one week, add it all up.(you need to be sitting down when you do it).
Like most people, you may find you spend more than what you have.
How then do you pay for it, well a lot of us take from another area, till we get paid...and on and on go's this most, viscous cycle.
What you do then, is cut out some things....so that you can in part stop the cycle.
Even being able to stop part of it, means you are 'winning'! believe me.
Give up drinking take away coffee totally.Or buying a magazine, or even that odd packet of gum..or newspaper.
Re-write your shopping list, and take out chocolate, fizzy drinks, cake,for just 3 weeks.
You will see just 'how much they all cost''. It's unpleasant, but can and should be done.
People who have to have a budget,,,,do so because there is just not enough money, to go around.In the end, you will find ways to save your money.
It also can become a great deal of fun....but! it is up to you at the end.