Hi Gary. Welcome to our little corner of the 'net.
As for your table not being square, it doesn't really matter with the router bit. As Bob Rosenthal used to say, "the bit is round.. it will cut, doesn't matter which direction you come at it." What he meant was, it doesn't matter where you put your fence, if you set it up, and then pass across the bit from right to left, the bit will cut.
It's all personal choice here.. some people have t-tracks to secure their fence to and are very happy with them. I do not... I clamp my fence to the table. Find what works best for YOU and run with it.
Sometimes I wonder whether the world is being run by smart people who are putting us on
or by imbeciles who really mean it.