We've been doing some checking on those courses. It appears that most of the ASA schools require you to have completed the level 1&2 course before venturing into the more advanced and overnight classes. The 1 -2 course con frequently be combined. These teach basic sailing skills on small boats where there is less possibility of danger, power, injury. (cost of a mistake is a good dunking)
I agree with Mimsy. You will enjoy sailing together if you are not on pins and needles worrying about what she is thinking or about what mistake she might make. Much better to know you can rely on her to bail your but out when you need it. Otherwise, you are worse than single handed.
Women Sail offers classes in regularly scheduled cool vacation places and also will arrange to do a class on your own boat including mixed crew. Also, check the yacht clubs in your area. You may be able to find classes, find an instructor, arrange your own class program.