For non finance backgrounds, I suggest to start with Quant. SS2 is quite easy and gives you the basics of the time value of money and other topics. I suggest you leave FSA to the end but only if you make sure you have enough time to cover it and kill it.
killamanjaro, i did the same as you. FSA & Corp Finance first, as I am familiar with them. But now i realized they are the 2 most important topics and Im leaving the smaller ones to the end. Anyhow, review will make up for that.