Minimize the use of your credit card. Pay off auto and other debt which has over 9 monthly payments left. Lenders will be checking your bank balance for the last three months, and will notice any large increases in your balance during that three month period. Start saving even more for your down payment. Don't change your line of work.
Lenders expect breadwinners to be in their jobs at least two years.
Change to a job in the same line of work is OK, but this is not the time to make a shift to a different line of work. Income figures from self-employment are often averaged over the last two years. Postpone these purchases until you have moved into your new home. The monthly payment on the loan will vary, depending upon the interest rate, and the length of the loan. To estimate your payments, select the interest rate closest to the rate you expect to pay, and multiply by the number of thousands you are borrowing.