New mom help

I’m sorry if I sound completely dumb as a mom but I am stressed out about making sure I’m taking the best care of my baby, I just would like advice or reassurance if I’m doing the right thing on a few problems. I’m feeling pretty overwhelmed and I feel like I’m not a great mom.

My baby is two weeks old and already has had a diaper rash for probably about a week. We have tried desitin this last week religiously and it hasn’t gotten any better. My mom said she used cornstarch for us because we were sensitive to the chemicals in rash cream. We just started using it Has anyone tried it and is there anything else that could help to also get rid of it?

He also has really bad eye boogers, I swear every time I clean his eyes a new one is right there in a few seconds. We have tried wiping them with a warm wash cloth/baby wipe the most. We tried squirting breast milk once but I haven’t quite gotten the hang of that yet. We were told we could try a little bit of baby shampoo on a rag. Do you recommend any of those or something else to help him get rid of them or at least make them less often?

Also a bit off topic but he pees on us literally every time we change him (sometimes more than once lol) is there anything that we can do to encourage him to go before we take the diaper off?