The photos automatically become copyright to you the moment you create them. Filing the copyright is not strictly necessary per se.
A trademark would apply to the name/logo you use to identify yourself/your company. Again, the trademark automatically belongs to you once you actively start using the mark. Filing the trademark is not strictly necessary per se.
Filing gives you added protection (as well as options should you need to pursue legal action), so it might be a good idea to file.
You might also want to take your idea to a local IP attorney. If you are featuring motorcycles, you will want to make sure that your calendars do not infringe on the trademarks of the companies manufacturing the bikes. This business venture is NOT one you will want to take solely based on the free advice you get on an internet forum. You are gonna wanna sit down with an actual lawyer on this.