You could use a timeline like this one to see what Sailor Moon chapters each side-story was published around the time of. (If you're reading the newer collections, you'll have to add 1 to every chapter number after a "Part 2" on that list because it's referring to the numbering in old collections that combined a few chapters to reduce the total to 52.)
I love Codename Sailor V and the side stories. I thought they really add good character development to the characters and Codename Sailor V is like a whole new season that focuses on Sailor V like a season 0.
Sailor V is a good read. It has the same kind of setup that the original Sailor Moon anime had. The drawback is that up until around the last two chapters, there is really not a lot of character development for Minako. But there are some great support characters in the story, and the story is very funny. One character, who resembles Umino, actually helped Sailor V fight a monster or two.