Look up "installment sales" on the IRS web site for more information.
From what I can tell, the $500k exclusion applies regardless of whether it's sold in an installment sale or not. Per
Pub. 523, you only need to report the sale to the IRS if the gain exceeds $500k, if you receive a Form 1099-S related to the sale, or if you choose to be taxed on the gain (which will probably only happen if you expect to sell another primary residence for a bigger gain within two years). If any of those apply, you'll need to file
Form 6252 to report the capital gains portion each year until the contract is done.
The interest income doesn't go on that form, it goes on Schedule B with all your other interest and dividends (or directly on the 1040 if the amount is too low for Schedule B).