No... you don't need business school to learn how to invest. Business schools allow you to work in a big firm and stuff. Investment is something you can learn on your own.
I suggest studying for the Security 6 series and the Security 2 series exams to start.
Then, maybe go for a cfa. (this is really hard, and you can omit doing this.)
You should at least have $25k to start off investing. Do not risk more than 50% of your worth. At least half of your funds should go with safer routes such as bonds etc.
Start with Index funds, they usually will beat the inflation rate.
If you have money now, several good mutual funds (with good long term gains over the years) have just took some losses, so now is a good time to get into them:) Look out for all those fees though:P