For Mughal coins, the first priority is to get a coin with as much as possible of the date, regnal year and mint name on the flan. That means, you would do well to pick up Arabic writing. I strongly recommend
Arabic coins and how to read them by Richard Plant.
If reading the coin is a top priority, legends being clear is important also. Fortunately, Mughal coins are designed in broad and bold strokes with much relief, as your coin shows; I am convinced Mughal mints used hot striking. Mughal coin "grading" may be summarised as: not completely legible, legible, date or mint on flan, date and mint on flan. A "rarity scale" might be: common, well known but difficult to find, found by accident only, discovery coin. There are several discovery coins on WoC.
Since even today, much is unknown about Mughal coins and unsubstantiated numismatic legends abound, they require research. You cannot rely on KM. This is where the WoC community comes in. If you like research, there are few fields as rewarding as Mughal coins.
Peter