I graduated recently, but I'm going to take my pre reqs this coming fall. I took no science courses in undergrad (except rocks for jocks! yay!), so I'm wondering, when I do enroll, how many classes does the average non traditional take each semester?
Yes, you should definitely strive to take a full load of classes each semester. On average, this amounts to roughly 16 semester credits, but this can depend on factors such as your school's definition of full time and your comfort level. I believe my alma mater considers around 12 credits to be full time, but most pre-medical undergraduate students will average around 16 credits/semester, up to around 18, or so, but this is because they take non-science classes also. I stuck with around 12 credits, mostly, in my postbaccalaureate work, with a couple of classes in the summer; they were all science classes. 16 semester credits is 4 science classes with lab, and 12 credits is 3 science classes with lab.
I read in one thread about an individual who was getting turned down by med schools because he/she wasn't taking a full course load during the post bacc years.
Some schools probably would do this, but definitely not all. Mostly, however, schools consider it a red-flag that you are not taking a full load; that is, it is cause for concern for them, and is not viewed favorably. They want to see consistantly good academic performance across a full schedule. Many schools do take into consideration that some people work during school, and that this can cause a student to take fewer credits than they normally would.
So, basically, one should be a full-time student taking the pre reqs?
If it is feasible, then it would certainly look good, and you'll be complete faster, too.
And should this full time course load be 100% science? And finally, what are the best classes to take first?
No, it doesn't have to be 100% science, although I chose to do it that way. I know in my undergraduate work, I took about 2-3 science classes per semester, mixed in with other classes, such as humanities, etc. In postbaccalaureate programs, however, it is my impression that students generally take all BCPM classes with maybe one other type of class mixed in to round things out a little. They also tend to take only the classes that are required for medical school admission. If they have already satisfied these requirements, they will then take more advanced BCPM classes.
I cannot suggest what classes would be best for you to take first. This is something best done with a school advisor. I can only tell you that I took General Chemistry I + Lab, General Biology I + Lab, and Physics I + Lab, during my first post-baccalaureate semester; 12 credits. It was pretty challenging with all those labs; in general, labs are quite time-consuming and the write ups are not too fun, but doable. I got A's in all of them, but I had to work hard. Work with your advisor to make a suitable schedule so that you feel that it is doable and one that won't jeopardize your grades (it's better to take fewer classes than overload and do poorly, of course).
Good luck.