Trying to convince him that you're right (because you read it on the internet) and he's wrong isn't likely to go down very well - it makes people defensive and also he'll feel smugly right because he's been there before. In reality there is no one right way to raise a baby but everyone feels their own approach is perfect.
Instead I think it would be useful to talk to him and say you're feeling criticised and that he needs to back off and give you some space. That you are aware you'll make mistakes - but you'd like the opportunity to make them, and learn from them! Like every first time parent. Like he did with his first. And also, that everyone has different parenting styles, that you don't want to do everything exactly like his ex, and you're hoping that you and he can work together to find your own shared style and learn from each other. But to do that, you've got to trust each other, which means that when he's looking after the baby, you don't criticise or comment, but when you're looking after the baby, he has to offer the same courtesy to you. Tell him it's making you feel small and patronised to be told things as simple as how to push a pushchair, and maybe make an agreement that if you want the other's take on something, you'll ask for it.
It can also be helpful when discussing specific issues, instead of insisting it needs to be done X way, decide what is important to you about your way and explain this. So perhaps "It's important to me that we don't leave her crying unnecessarily. That's why I don't mind cuddling her after a feed." That gives him a chance to explain what is important to him, e.g. he might feel it's important she doesn't get too dependent on being held so that you need to hold her 24/7. Then you can actually discuss from there - whether you also agree with this or disagree, and hopefully find something in the middle which meets both of your goals.
I would be wary of just waiting until he goes back to work and doing it your way, this could end up a bit you vs him and it would be beneficial to all of you if you can find a way to discuss issues like this, otherwise it's just going to come up the same again and again and be frustrating if he expects to always have the final say all the time.
Remember that parenting might not be new to him, but this baby is new to both of you, and what works for one won't necessarily work for another anyway so you will need to work to find your balance with your new baby.
Good luck!