Job application tools have dramatically changed since I last applied for a job, so the method you use to take care of this step is all yours. I do suggest you apply for all the jobs you identified in Step 3 and 4 that you are still interested in pursuing. Choice is always a good thing.
That said, you might want to ease into the number of jobs you apply for to start with so you can learn what works and what doesn’t from the process itself and then make modifications if necessary. You might save the jobs you want most until after you’ve practiced with a couple of other jobs. The risk in doing this, of course, is that you’ll be offered one of those first jobs before you apply for the jobs you want most.