As I'm sure it is for many, starting from scratch on a substantial new army, or even a small one, can sometimes be daunting, given all the prep work that can be involved to get miniatures ready for painting and basing.
I'll personally be working on 15mm and 25mm/28mm scale minis, but suspect a lot of the techniques can be used for other scales as well, though perhaps they differ with larger scale minis, vs. the really little ones, e.g. 12mm figs, and smaller. No doubt, there are probably different techniques for dealing with metals vs. plastic figs too.
Seems to me having an organized and reasonably clutter-free work table would be a good idea, and working in batches assembly-line fashion might help speed things along. A variety of small files, sandpaper and/or sanding sticks, and a scalpel, or X-Acto knife would be key tools too. Perhaps even, a small battery powered Dremel, powertool, also.
A plastic container or baggie filled with those to be prepped, vs. those done, and ready for a post-prepping bath might be useful (in order to remove dust and any residual shavings, etc.).
So, any good tips (great ones would be appreciated too), for inspecting, quickly getting rid of mold lines and casting imperfections, etc., etc., on both metal and plastic minis?