What are the steps to creating homemade paper using bark?
Here's a list of instructions on how you can make home-made paper made from wood:

Collect dead or fallen trees. You'll need around 3 kg (6.6 pounds) per 1 sq meter
(10 square feet) of finished paper in order for it be completely tree free and contain no contaminants like plastic, synthetic products etc..
Cut down the tree into pieces that will fit your shredder and grind mill size. 
Grind these pieces until the fibers become too small to feel through your fingers (3mm is about right), but not so fine they won't pass through a mesh screen. 

You may do this with an electric grinder, although an ordinary hand powered one would probably work if it has coarse enough settings, or even a rock tumbler at full power on a stove.  Note that only coarse abrasive powders might get ground; finer grit materials will likely get trapped between fibers after pulping and not help your pulp strength either.
Rinse out any remaining particles left over in the water - especially large ones, which could possibly lodge between fibers during drying before firing them up again if you're going to use some traditional way of making pulp.
Add fiber to make the first run through the grinder/miller. Try getting around 50 grams (1+ ounces) for a sheet of 12 x 30 cm (4' wide by 10') as a starting point depending on what kind of papermaker you want. Use something strong enough to push back against big chunks like sawdusts, rather than weak stuff prone to fly away under pressure, eg corncobs! Note that the more fibre added in total makes things harder to handle, while less leaves bubbles and other problems due to air entering the system, however you'd have to try both extremes for each ingredient added.
Pass this mixture though pulper into another container, put lid on top and move bucket side ways slowly towards pulper head. When you reach position