How much of pauls teachings were commands and how much were good advice.?

Paul's writings were inspired. If He said it, we should follow it. The only place he offers his personal advise is where (I forget the book and chapter) he specifies that he thinks it is best for a man not to marry but to devote his entire life to God. He then goes on to give God's direction that if there is no self-control, a man should marry a woman so that there will not be so much immorality. Eveything else he wrote, as I recall, is inspired from God.