Need exact directions please

I planned on doing baby led weaning when my son turns 6 months. However I don’t think he will meet all signs of readiness by then (he’s nowhere near sitting up for 1 min unassisted).

His pediatrician told us at his last appointment that she supports BLW, but either way, he needs to start eating by 6 months so he needs purées if he isn’t ready for table food.

So, mamas who make their babies purées, how exactly do you do it?! I need alllll the info please! I want to start with veggies first. Do I boil them? Steam? Then what?

Thank you!!