Do you have any prior CAD experience? What level of school have you completed? Have you taken drafting classes? Are you brand-new to solid modeling?
Your answers to these question is critical to any meaningful advice anyone can give you. There are a wide variety of types and levels of training available, at a range of prices. As an experienced CAD user who recently returned to Pro/E, I have found the PTC University offerings in the area of on-line tutorials quite useful, and cost-effective (free to the big company I work for). But if you're a rookie, something more personal and in-depthis necessary.