First off welcome to the guild
Second, you're map here need to be cut in half vertically due to the wrap around effect. A map like this should be twice as wide as it is tall...polar caps at top and bottom and the map wraps around like a tube so that the edges join up and the poles don't.
Third, since you're going for a parchment or antique style, you can make your cities, towns, and such anything you like without regard to proper scale. Draw them out from a side view or isometric view (three-quarters top down like the old Zaxxon game or Q-bert squares). They don't have to look perfect they just have to convey the information that there is a city in that spot.
Fourth, look through the Tutorials section to find all sorts of helpful guides for making mtns, forests, n such in a hand-drawn style.
Good start by the way and just that one minor tweak, but it probably means re-working the whole thing.