I want to draw realistic concept art/maybe some manga, but I only have limited supplies.

I have: Dixon Ticonderoga Pencils Papermate Pencils 12 Pack of Daler Rowney Sketching Pencils (4H, 2H, H, F, HB, 2B, 3B, 4B, 5b, 6B, 8B)

I also have Photoshop CS5, but drawing with just a mouse seems...impossible for me.

When it comes to hand drawing, do i have enough draw at least semi-realistic?