Hi Solo;
I just got my new Dewalt also and I have been searching high & low for blades. I came across a video on You Tube and I wrote down this chart for blades.
#2 blade for 1/4" soft wood, #5 blade for 3/4" soft wood, #7 blade for 3/4-1" hardwood, #9 blade for 1 1/2-2 1/2" hardwood and #12 blade for straight cuts/rips.
I hope this helps and hopefully this is accurate.
Rod