My 2y2m old son is showing interest in going potty, he's about 50/50 on success after a couple weeks of him doing his own thing. He's in pull ups, but he feels like he needs to strip all the way down from the waste down to go potty

My question is do you train them sitting or standing to pee from the start?

He sees my husband standing obviously but then he sees me sitting. He tries to pee standing into the regular toilet but he's still just a little too short, but he will also sit on it. He only sits on his potty chair, and he refuses to use the whale urinal in the hall bathroom even after I made my husband pee in it in front of him so he could watch Dad do it.

I am 1 of 3 girls so my mom, and my sister has 3 girls so neither one of them has any input , and we are no contact with my in laws, so I have no idea what to go off of.