Proper way to connect joist to top plate?
The answer ultimately depends upon your local climate/weather (heavy wind loading?), but generally the way to handle that situation is to span the joists at the top plate with a "rim joist", then toenail all the joists to the top plate.

BTW... you might want your top plate to extend over the top of that corner post instead of nailing to its side.

SketchUp's neat stuff, isn't it? 8)