I remember breezing along on my first quilt, thinking, 'this isn't so hard!' Then it came to putting the blocks together and nothing matched up. I was so embarrassed when I brought the quilt in to my LQS to choose a border fabric, but the ladies were so nice. The employee who helped me with the fabric pretended she didn't see anything wrong, and the owner said, 'we're here to have fun, not to be perfect.'
You will learn as you sew, and as you read about quilting or watch tutorials, or participate in groups like this, and your results will be better every time. If books are your preferred learning method, Harriet Hargrave has a series called Quilter's Academy, which will tell/show you everything you want/need to know about quilting. The main thing is, keep sewing. Since you have trouble differentiating between shades of color, I think a kit would be an excellent idea, but I would suggest sticking to something simple that uses squares and rectangles.