how do i know which accounts are going to be debited and credited. how do i do the journal entries

1) The $1,005.50 account balance of customer Buster Jenkins has proven to be uncollectible and is to be written off. Granite Bay Jet Ski uses the allowance method for all bad debt write-offs. When the invoice number is requested, type WROFF.

2) June 4 Received a check for $1,090.00 from the Sierra Jet Set for storage fees on personal watercraft and equipment and issued invoice number G4012. This check prepays their storage fees for June, July and August.