Welcome to YT!!!
Clean your house thoroughly with an ezymatic cleaner. We might smell clean, but the canine nose is more sensitive, and can still smell the accidents. What do you do when your outside? Get him walking and running around. Activity seems to help them "go"
It helps to have them associate going potty with a word or command. Carry a small treat with you, something really tasty and completely irresistible. Save that treat for potty trips only. As soon as you see him go, say the command, and immediately treat when he is done. It also helps to not give them free roam of the house until after they're potty trained.