Potty training tips/advice needed please

Put pants on him. He'll feel wet and realise its uncomfortable

Underpants and he cleans up the mess.

If he won’t use his body, have you tried a toilet seat? My three-year-old is potty trained on both and has been now since he was 2 and a half. Sometimes he prefers to use a toilet over a potty, and just try to stay consistent. If he has an accident don’t make a big fuss, just say “wee wee’s go on the toilet/potty” and put him on there while you clean up.
After a couple days he should start to it, day 2/3 is always the worst but by day 5 he should start to get it. Also don’t just stay in the house because you’re scared of na accident, he’s potty training he will have accidents.

Have you tried a sticker chart. Every kids loves stickers and a treat. Doesn’t have to be big. Everytime they go to the toilet make a massive fuss over it. We used to tell important people in his life when they would see the him that he did well in potty etc. I would just keep going with it. You started it now so don’t stop. When has accident don’t make a big fuss, remind them where there meant to go. Try taking them every hour or 30mjns to begin with. Might like toilet over potty.

Try a toilet seat and sit him there every half hour. Get something to keep him entertained for 10mins and just keep repeating it xx