Hi Tamara and welcome from Ohio!
You're normal and will find it very common among quilters.
About the thread question, use what you like, what matches in color and can afford.
IMHO, if you are working on an "heirloom" quality or "keepsake" type of quilt..then always use the very best that you can. I would even save up for the best quality of fabrics and threads for these. Also quilts deserve to have labels.
Please feel free to always ask any questions that you may have, someone(s) will be helpful in sharing their comments.
Pam M