Your first tour will most likely be in a squadron, as the Aircraft line Divo, and will move your way up to Quality Assurance Officer, then MMCO, AMO, and MO. mmco ( Maintenance Material Control Officer, AMO= Assistant Maintenance Officer, MO= Maintenance Officer)
This is a basic career path for an AMDO
To echo what Heyjoe said, squadrons typically have an O-4 pilot/NFO as the MO. He's the department head.
The progression you listed isn't really a career path, that can all be knocked out in your first squadron tour.
What you get really depends on your squadron, typical billets include MCO (material control officer) and AMO and MMCO as listed above. Some squadrons have enough aircrew to fill the Maintenance divisions (Aircraft, Line, AV/ARM) and QAO, so you may or may not get to do that. Typically F-18C squadrons let their AMDOs do the Div-O jobs because they have 2 1520s assigned to the squadron, whereas others only have 1.
As for the rest of your career, there's the AIMD side of the house you'll have to do. I'm not familiar with this, but as a JO you'll most likely do a Div-O job.
Moving on to O-4, you're looking at either being the MO for an AIMD on a Phib, the CAGMO (Airwing Maintenance officer), or the AMO or MMCO for the AIMD on a carrier. At O-5, the only fleet billet is the MO for a carrier's AIMD.
As heyjoe mentioned, there's the aquisition route, etc. In other words, you don't need to be the MO of a carrier for it to be considered a "successful" carreer. I just listed the fleet billets. Hope this helps.
With it being such a small field, how many are assigned to each fleet?
Like I mentioned above, F-18C squadrons typically have 2 AMDOs, 2 LDOs, 2 CWOs. Most squadrons will only have 1 of each. Carrier AIMDs probably only have 1 or 2 JO AMDOs, with the rest being LDO/CWO.
Do you really have a lot of paperwork?
Yes. It's the nature of the beast. As an officer, you're not a wrech-turner, nor are you specilized in an airframe. It's maintenance management, which means paperwork.
rg has more info on the Navy side.