For my fine art prints, I have a 1"-2" white border on the print, and I sign my name there using a Sharpie acid free pen. Another photographer I know uses the same pen, and signs the print like I do, and the mat.
On the back of the mounting board I have a sticker with the print name, number, a statements saying that the print will last up to 98 years if displayed behind glass, and my website address.
If I were to put a date on the print, I would put the date the photograph was taken.
You can put the title, date and your name wherever you want. I've seen the title put on the center, and left corner of a mat. The signature and date on the center and right corner. So whatever you feel is best for you.
HB is fine.