Congrats on getting a great lens, April! Macro shooting needs patience and development of skills that are important to the field, but the rewards are there.
I'd have a tripod on hand when you're shooting macros so you can get the narrow apertures that give you a reasonable depth of field -- if you shoot at something like f/2.8, those tiny shots will have very little in focus. Even f/16 will surprise and/or dismay you at how little is in focus when macro shooting.
Just so you know, a lot of the ultra-close bug shots are done with the MP-E 65mm lens that is capable of 5:1 magnification -- that is, a bug will present an image on your sensor that is 5 times its actual size. The 100mm macro has a 1:1 magnification, meaning a 5mm bug will appear on the sensor at 5mm. So, don't let some of the macro images you see throw you off. Use your lens to its best capabilities. Shoot things that will fill the frame as much as possible -- you will be able to get some amazing stuff if you just stick with it.
You can also use tubes and TeleConverters to get closer (with tubes) or more magnification. Also, pack a flash and a hotshoe flash extension cord. There are special macro flashes, but if you have a regular hotshoe flash you can handhold it to light close-up subjects that would otherwise tend to be blocked by the lens shadow.
A method that people have used with very nice results to combat the narrow depth of field is called "focus stacking". This is where you take a number of shots for which you slightly change the focal plane to get a wider depth of field. I've seen some great results from this, although if you are shooting a moving bug you'll get uncertain results
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Have fun! Shoot a bunch of different subjects/objects to get a feel of how to do this (and to get a whole different perspective on "how things look")! Since your husband got this for you, go ahead and make him sit for a portrait of his eyeball! Play!