What do you mean by courses? Programs? Doman advocates that it is best to start with Reading (it's the staple of all the knowledge and the most important program), then add Math, then Encyclopedic Knowledge, Music, Foreign Languages, etc... Whenever you are comfortable.

What do you mean by "the same time"? The same day? Or during the same session? Please clarify and I (or other members of the board) will definitely do our best to help you out.

You can also find some more info here: http://www.childandme.com/how-many-times-day-it-realistic-show-sets-flashcards