If you are paying off a mortgage, you have little room for error, so make sure sufficient funds are always available to pay the mortgage bill. You do not want the bank to foreclose on your most expensive investment. Have a budget for each month and leave a cushion for unexpected expenses. Also, keep a 6 month emergency fund, if one of you loses a job.
Keep in mind, if you have a fixed mortgage, that rate will not change. Usually insurance and taxes are paid together with the bill. Insurance and especially taxes go up, so your monthly bill will increase from time to time.
Purchase your items on the lowest interest rate cards available and make sure you can completely pay off the cards in a few months. Otherwise, before you know it you will be inundated by debt.
Periodically, check your home insurance rates. There might be items you are paying for that are not needed. You might also be paying too much. An example being, living near a fire hydrant should be included in items that will lower your premiums.
You can splurge occasionally, but always have money left over for home repairs. Homes tend to get costly when least expected, like a leaky roof or a broken air conditioner or heating system.