A good starting point in your quest to make a home budget, is to take stock of your current and recent situation, and list out all your monthly outgoings. If you only do this from memory, there is a chance you will miss one or more important items. You probably have several sources of information on what those regular outgoings are, and whether they are easy to find depends on how well organised you are with your paperwork. It is worth checking back over at least three months bank and credit card statements, and jot down what your regular payments are out of those. At the same time, you can also make a note of items of expenditure that may recur later on.
Another source of information will be the bills and receipts that you have received over the past quarter. If you have not kept such documents and records before, then now is a good time to start. The good organisation of your important financial documents, and orderly filing of bills and receipts, will stand you in good stead for controlling the family budget when it is set.