How much earnest money should I offer?
Often 1% to 3% of the price, but local customs vary. More earnest money can make your offer stronger, and it counts toward your costs at closing. ListingCraft for Buyers's offer screen lets you set it and shows how it affects your cash to close.
Your earnest money is at risk if you back out without a contract reason, so keep your contingencies in place if you put down more.