Try to build or buy the best mining rig for your money reserved for this investment.
You will not make 5$/month, but don't think you will make millions.
Bigger investments results bigger profits.
I don't have a lot of money to invest at this time, that's why the USB Miners are the most realistic starting point for me.
I think it would be a fun project, and bring me joy knowing that they were hashing away while I slept, or went to work etc... even if the gains aren't huge.
This is more of a hobby than a business venture at this point. I can always scale up as my knowledge and passion increases.
Of course I would like to make some of my initial investment back, but I don't expect them to pay for themselves for a long time.
I wish I had made a big investment back in the day. I had heard of bitcoins, even read about people building GPU mining rigs, but I didn't really know what they were. If only I had been mining all this time.