Easy baby blanket?

Lorelai
Hi ladies!
Can any of you recommend an easy baby blanket pattern?? 
I'm a total beginner and can only do garter stitch...😁
I've read it's easier to do on circular needles so I've bought some 80cm /4.5mm ones
I've also bought some sirdar baby wool, 50g 
Yardage: 165m/179y. Pic below!
Any tips?? X