Looks like you've got yourself a nice dissecting scope-- great for doing dissections (
) or looking at microcrustaceans, little things, some gross tissue work, some parasites, but to see bacteria you will need something with a stage to put slides on and some stronger objective lenses. I don't know what your magnification is, but most are in the range of 60X. For staining microorganisms you'll need an oil immersion lens for a total magnification of 1000X.
Do play around with it though---you will see amazing things. Bristelworms are especially cool--
Also, you are lucky in that you have a trinocular scope, which means you'll be able to hook a camera up with the right adapter.