4 years ago when I started to lean to sew and was sewing my first ever t-shirt, I went through this blogpost for neckband sewing. As you can see the sleeves came out awful but the neckband was superb for a first ever! Thanks to the instructions.
http://www.craftstylish.com/item/8413/how-to-sew-a-classic-t-shirt-neckband/page/all