Congrats, we are expecting number 2 in early to mid July. First one just turned 4 today.
There is already lots of good advise here so I won't add much to it. Just figure out what works for you as parents and your child, don't let anyone tell you that you are doing it wrong. Feel free to listen to advise, but it is your baby and your family, you will know best even if it doesn't feel like it. Also somewhat counter to the point I just made, accept help, genuine help is awesome to give you some time and breathing space if you need it. Don't feel bad if someone else holds or walks your baby while you go and get a coffee with your partner.
Enjoy it, it is a new and fun journey.