I am going to tell you something that will make your life much easier with regards to industry:
Use the shift key plus directional keys to make a 21*21 room centered on your central staircase. place three mechanic's workshops in a row coming down from the central staircase. Place a row of three masons workshops to the left of the central staircase. Place three jewelers workshops to the right of the central staircase, and place 3 craftsdwarf's workshops to the north of your central staircase. In the top left corner, place a stockpile for furniture, place a stockpile for finished goods in the top right, place a stockpile for stone at the bottom left, and a stockpile for gems at the bottom right. This area will let you create high value furniture and trade goods all on the same level. Which is nice.
At the same time, you can mine out a largeish area north of your craftsdwarf workshops, and designate this as a refuse stockpile. Remember to put a door in the wall! This way you will have easy access to bones for bone crafts and bone bolts at your craftsdwarf's workshops.
And here is probably the thing that takes you the longest to safely figure out as a noob (or at least, it did for me): safe garbage disposal. In your refuse stockpile, build this:
side top view
view
z+1 z+0
_PS o ooo ooo
__oBo oho oBo
oSo ooo
oPo
o_o
h hole
_ floor
o wall
S track stop
P pressure plate
B raising (NOT retracting) one-tile bridge
Build the track stop with d-C-S, and set it to dump in the direction of the hole in the floor (press d once you've selected track stop in the build menu until it says "dump north" if the hole is to the north of the track stop. Build the pressure plate with b-T-p, and set it for any weight and to trigger when citizens step on it (the menu is fairly intuitive). The bridge you just build with b-g, but make sure you press w, a, x, or d before placing it to make sure it raises and DOESN'T retract. Once the bridge is built, (q)uery the pressure plate and link it to the bridge with a-b (You will need 3 mechanisms built at a mechanics workshop out of 1 stone each to build this).
Once you've built this, (make sure the bridge is completely walled off once it's linked up!) construct a wooden minecart at a carpenter's shop. then press h to open up routes and press r to create a new minecart "route." Move your cursor with the arrow keys onto the track stop and press s to create a new stop, and then go into the stop's settings menu. Press x to remove all the depart conditions, then move your cursor onto the refuse stockpile and press s to set the stop to take form it. Press enter to set desired items, in this case: refuse corpses, items, and body parts. Press esc to exit the routes menu, and voila, you have a system that will dump refuse onto a raising bridge which will pulverise it into oblivion, and it's all automatic, no oversight needed.