How do I take a picture chart and create a baby blanket?

Can someone please help me or offer a resource? I’m going to have my 1st grand baby. I have a Minnie Mouse chart but I’m not confident on converting it to a baby blanket. I’d like a stockinette with the chart centered? I know this is probably an easy answer, but can someone point me in the right direction? Thanks so much!

I’ve never used this, but it seems doable.
http://www.microrevolt.org/knitPro/