How to start potty training?

I’m needing advice? I have 3 boys and the 2 older ones we had help potty training them and it went smoothly well now my 2 year old we are on our own. I have introduced him to the toilet he knows what u do in the potty but when I put him on the potty OMG he throws a screaming fit I let him down after like 10 mins when he wont go. not 2 seconds later he pees in the diaper🤦‍♀️! any suggestions or ideas? anything would help?