Seek out the instructor who expects you to do it well and will not accept that which is only adequate. The instructor who is willing to offer constructive criticism will generally demand more of you and as a result, push you more towards excellence. In addition the instructor should also be aware of and informed about the various Salsa activities in the area. In closing, remember that the class environment should temper all of your expectations. Salsa is taught in many forums.
Classes can be group or private, single level or multiple levels.
The teaching goals vary based on the type of dance class being taught. The teaching objectives of a large basic dance class may be to only introduce the basic dance step and to assure that every one has fun, whereas the goal of an advanced class may be to teach a specific dance step or steps at each session. Ask the teacher about the class objectives. Visit the class and observe how the dance class is taught. Try out the class, and the instructor.