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you can take math and business classes, you'll have to read investment books of course and understand basic economic theories. If you are in the US you can try to apply for Ameriprise, they hire entry level advisers. they are sales oriented and not very admired compared to other advisers, but it gets you into the doors. you can also start to work as a banker and when you understand well the financial products u either work you way into the investment department in the bank or seek a job as an adviser in an investment company

The two most common credentials for financial advisors are:

Chartered Financial Analyst

Certified Financial Planner

Courses to take are:

Math - at least through calculus and statistics

Economics

Accounting

Business law

Estate planning