Overall most people tend to learn better this way rather than trying to learn all Excel formulas at the same time as this can be very confusing. Most of us tend to learn in smaller packages of information and you should look for a course of instruction that will allow you to do this. As you are learning to use Excel you should of course start by learning to use the formulas that you are actually using or are likely to have need of in the immediate future.
For each of the items listed, decide whether they are monthly, quarterly, or yearly, payments, then repeat the monthly amounts in all the columns that apply. For example, monthly payments will go in all 12 columns but quarterly in only in the four columns when payment is due. The next stage is for you to consider what other necessary expenditure will come out of your income every month. These other expenditure items probably do not show up as regular payments in the first stage, though individual payments may. These items may include food, household goods such as detergents, car maintenance, petrol (gasoline), and fares, which are essential to you, and you need to budget for each month.