Well, the ideal way is to begin with Volume 1 and go through each subsequent volume. This ensures you don't miss any crucial plot developments or character growth. Some people might jump around, but for the full experience, stick to the sequence.
You should begin with Volume 1 and follow the numerical sequence. Each volume builds on the previous one, allowing you to follow the plot and character development smoothly.
I'm not entirely sure, but it's very likely. TvTropes is a comprehensive database for all kinds of fictional works. Given Konosuba's popularity, especially in the anime and light novel world, it would make sense for there to be a section about its visual novel on TvTropes. You could check by searching for 'Konosuba visual novel' on the TvTropes website.