Young, Green investor. Questions abound.

[benjamen]

In order to minimize transaction costs, most people spend at least $1,000 per purchase. A rule of thumb you will see a lot is to spend less than 0.5% on transaction costs. For example, if your broker charges you $5 per trade, then you should spend at least (5/0.005)=1000 dollars. You can spend less at places like motiff that have no purchase costs, but this will lead to fractional shares.