The main thing to include in your monthly budget is all your bills. This includes rent, utilities, car payments, and any loans or other debt you pay per month. After that, you need to include how much money you spend on gas and food. Be realistic and see how much you spent the month before to get the best idea.
You should also include a savings portion in your monthly budget. Even if it it’s just a little, you should be putting some money towards savings. You should also include a space for entertainment, clothes, and other miscellaneous items you might need every month.