personally, I would say that aiming for a blanket is rather ambitious. It can be done, but it might be best to start smaller. Much smaller.
I started with swatches. Practice practice practice those stitches until you've got them mastered. Then move on to something easy... such as a flower or motif of some sort. Once you think you have the hang of how to make the stitches, then try something such as a scarf or a hat. Baby steps.