The benefits of not going through a broker are quite large when adding up all the fees that would be saved over the years. After finding the phone numbers to call for an enrollment package or requesting one online, the next step is just as easy as filling out the enrollment form and sending a check right to the company.
Different plans have different initial enrollment minimums.
After your DRIP is started you should continue sending in money to buy more stock and increase your investments. At the bottom of the statment is a tear sheet that you can fill out and send with another check to keep investing in the company. Do this whenever you like, either weekly, monthly or when ever you have extra money. These payments are called OCP's or Optional Cash Payments. There are generally minimums that you may send in, so please read your individual stock plans requirements.