I'm so proud that you've made your first block quilt. Like Iceblossom said, most first quilts are just that....first quilts....that will improve over time.
Personally, I love kits from Connecting Threads. I have bought and made several from them & they always give generous amounts of fabric to make the kit. I mostly buy my thread from them also even though it leaves a bit more lint in the bobbin area that requires cleaning the bobbin area more often. They also have good customer service.
Don't forget to measure twice/cut once. Sometimes it takes getting used to quilting rulers & you may think you are cutting a 2 1/2" square and you are actually cutting a 2 5/8". That little 1/8" over will make a big difference when it comes to matching seams.
Keep trying & practicing. You will see improvement with time.