My first quilt (probably 20 years ago) was king sized. I didn't know anything!!! It is too small--only goes to the edges of the mattress. I didn't know that you needed to measure the area to be covered. I also did not know that you needed to buy all the muslin for the background, same dye lot, so that doesn't match. We still use it sometimes--I'm saving the good quilts for my old age. lol
I've learned a lot in my 20 years of quilting and my quilts look a LOT better now, but that old quilt is a happy memory and I don't think it will EVER wear out. Good luck with your first quilt. Maybe a lap quilt would be a better choice for the first one. jmho.
Sue