Start ! there is no reason to wait now. As to the options for review courses, Gleim is really good to go for in my opinion. It really makes it simple for a candidate. The language used in the material is good, the presentation, the arrangement and all the other factors are really good.

Other option could be wiley but those books seem very complicated to me.

People say that Regulation is the toughest, which, to some extent is true. Becker, Audit are comparatively easier. But it really can't be arranged in an order in general. I would suggest you to read the contents of the syllabus, and take that subject first which you feel most confident about. Keep the tough ones in the middle and conclude the series with the next easier section.

Hope this helps.

Apurva.