Rhodia notepads are highly recommended by calligraphers. Super smooth, the paper holds most inks well and is transparent enough for a gridsheet.
 
I highly recommend these pads and sell them on my workshops. 
 
Read a bit more about The Best Calligraphy Tools for Beginners in my Journal
 
Rhodia A4 Notepad (No. 18) - A4, blank, white, 80 sheets micro perforated sheets, top stapled. The paper is transparent enough for a gridsheet to help keep your writing on point!
 
Rhodia A4 DotPad Notepad (No. 19) - A4, dotted, white, 80 sheets micro perforated sheets, top stapled. The dotted pages help give guidance whilst writing.
 
Rhodia A5 Graph Notepad (No. 16)  - A5, graph, white, 80 sheets micro perforated sheets, top stapled. This is a handy little pad to pop on your desk or bag!