A couple more points to what's already long :-)(posted 8392 days ago)I do not recommend reusing fixer that was previously used for film for papers. (it makes paper fixing process slower and less efficient.) The other way should be ok but I personally don't do it either; I keep working fixer for film and paper separately.
Film, film developer, paper; these three things affect the character of resulting image the most, and the combination of these three is important. Some combinations just don't seem to work to get a particular image quality without lots of difficulties... If someone just recommend a film, or just a paper, don't totally believe it, but try to get a recommendation for a combination of these three, perferably from a person who can show you images made by that combination... but if you had worked in school darkroom for a while I suppose you already know what you like.
For some people grain is very easy to notice, and they tend to switch around films and developers trying to get finer or coarser grain. However, if you pay attention to things other than grain, e.g. midtone contrast, highlight brilliance, shadow rendition etc, you may find stocking an extra paper is much more helpful than switching around films (especially in medium format and larger, although I don't shoot large format).