Are you looking for an addition for the beginner nibs: to make it even easier for you, there are now two sets of calligraphy nibs online!
The following nibs are included in the Must have sets:
Zebra G: Similar to the Nikko G, a great beginner's nib. With the Zebra G you get thinner upstrokes.
Gillott 404: Also a nice nib to use as a beginner. Works well on multiple surfaces, also on paper with a structure. Eleonor Winters recommends this pen in her book as a pen for thin lines, without being too fragile.
Hunt 101: A flexible pen with a sharp point.
Brause EF66: This is my absolute favorite! Flexible for nice thick downstrokes and comfortable to write with. Nice thin upstrokes, without being too sharp.
Brause Steno: A nice sturdy semi flex calligraphy nib. Also very nice to use as a beginner. The nib is also suitable for writing on paper with a structure.