A1: you'll want to develop a system that uses or combines numbers 0-9 to form any number you could want to display (and since it's an rpg, you'll probably included all letters and symbols such as exclamation points, questions marks, quotes, etc, for dialogue). while you could use the built-in text commands to do this, most utilize a "bitmap font" system such as
this by Scraggle. check the post for how to use them as well as a variety of bitmap fonts he's created and served up for the community.
A2: the short answer is
B and, yes, you'll be doing separate 1-handed, 2-handed weapon & character sprites (unless you cheat (aka, be very efficient) and combine them both. ie, if you draw your sprites so they can be used for both 1 and 2 handed weapons (and what about carrying a shield?

).
with that, as a rule, you'll do well to create a variety of sprite sheets that all
conform to a base template of your character(s) so you could mix and match clothing, armor, hair styles, accessories, weapons, etc, thus providing variety and distinction with relative ease. see
this chibi site for an example of how this would work, and you could click the banner in my sig to see those sprite sets in action in the game Jimpo is working on.
the chibi website might be a little difficult to negotiate but click some of the links to pull up various sprite sets and notice how the clothes, armor, etc, are added (in layers) to the base character sheet to generate semi-custom sprites.