A first fountain pen does not need to be complicated. Start with a pen that feels balanced in your hand, a nib size that suits your handwriting, and an ink you can clean out easily.
The F nib is a sensible first choice for most handwriting. It is fine enough for notes and correspondence, and it responds clearly to changes in paper and ink. If you already know you prefer a broader line, wait for the additional sizes rather than forcing a narrower nib.
Choose the silhouette first. Heritage 102 is rounded and classic; Signature 105 is slender and tapered; Atelier 107 has a flat top and an ornate centre band. The finish is the second decision, not the first.
Before you fill the pen, read the included instructions and confirm the filling system. Do not force a converter or cartridge. When you change ink, flush the nib and feed with clean water and let the pen dry before refilling.