A friend of mine asked me once what income I made from copyright. My reply, everything I make is earned through my exercising copyright. Sometimes I have to sell it outright (Crown Copyright), but the rest of the time I'm licensing the work I produce.

It wouldn't be a bad idea to re-write point #1 so it's clearer.

Fact #2: If you are an employee, your work is likely covered by "Work Made for Hire" by default (here in the States), which means you don't own copyright to the photos produced as part of your job, unless you have a written contract giving you those rights. Something to consider before you demand employee benefits.

Fact #3: You should divide by 49, not 52, unless you plan to never take holidays.

Fact #4: This conflicts with fact #5. Either you charge by the job, or for your time.

Fact #5: As you get better and more efficient, you simply raise your rates. There is something to be said for using day rates rather than hourly, and it should be noted that it is easier to move a mountain than to raise rates on an existing client, so start with high hourly rates and just choose to not bill some of the time judiciously as you climb the learning curve.

Facts #6-9 I have no quibble with. Good advice.

But the question remains: What and how does one charge for assignments?

Number 8 is a great piece of advice. Don't fall for the "I know we agreed on $X, but we can only pay $Y." Make them follow the contract.

I re-read your lede three times and this point does not make sense to me. The creator has copyright unless he signs it away.