How much money will I have to come up with to buy a home?

That depends on a number of factors, including the cost of the house and the type of mortgage you get.

In general, you need to come up with enough money to cover three costs: earnest money - the deposit you make on the home when you submit your offer, to prove to the seller that you are serious about wanting to buy the house; the down payment, a percentage of the cost of the home that you must pay when you go to settlement; and closing costs, the costs associated with processing the paperwork to buy a house.