This is a very poor starting hand with no pair or straight/flush potential. Easiest way to play is to follow the big cards in back, medium cards in middle and small cards up front model. At least this way, you will likely avoid fouling.
Question 2 - Front
Although placing 6d in the middle row gives you a very good chance of making a flush in the middle (8 royalty points), it would be too premature as the odds of hitting full house or better in the back row at this point is very low.
Placing 6d in the front row gives you 1 royalty point up front, as long as you add another 7, 9 or 10 in the middle row.