Figuring out entries

If this is your day job, I would instead bump up your fitness profile. Like rather than sedentry, you'd be at least lightly active. It will account for what you do on your job without you adding anything in.

The easiest is to set your lifestyle to active so that those calories are accounted for in your daily plan already.

Icerose137 is correct. you will be cheating yourself if you add it in as an additional exercise.

I'm really new at this and I'm trying to figure out approximately how I should enter waiting tables in my exercise log, any ideas?

How often do you wait tables? If waitressing is your job, you should account for this in your Activity Level. If it's something you do occasionally (like maybe you do catering?) then log it as exercise.

Here's a great blog post on how to figure out Activity Levels and exercise that should be logged separately: http://www.myfitnesspal.com/blog/ladyhawk00/view/activity-level-and-logging-exercise-125513