Assassin Snails/shrimp

[Meggie :)]

Hey all! Just a few quick questions...I have a ten gallon tank with 4 balloon mollies (one of them is maybe 6 or 7 months old, the others are maybe 4 or 5 months old), one cherry shrimp, and 2 assassin snails.... I was just wondering, what is a good combination/number of assassin snails and shrimp that I can put in this tank? And what kind of shrimp do you suggest?

Thank you
Meg