Don't worry, microscope technique is a wide and difficult field, but you don't have to be an expert to start working with the microscope.
Your lamp base probably had a lamp socket when new, that places the filament in the right spot. They tend to get lost when power supply and microscope are separated. For perfect function this is necessary, but as long as you get a fairly good image I would worry later. These bulbs run quite hot, so make sure it doesn't fall out while switched on.
Do you already have a topic in sight that you want to study?
I think collecting some pond water would be fun. Or collecting some moss from the forest we have near by. I would also like to gather some sand from different places and check it out. And maybe look for meteorites in my gutter. I have a 10 year old, a 7 year old, and (oops) a 1 year old. So far the older kids have really enjoyed looking through it. So I think getting them involved in the whole process will be fun. Collecting samples from our hikes and then looking at them under the microscope.
I picked up a kit to make my own slides and a good amount of prepared slides.
All of this actually started when I got a meteorite from my daughter for Christmas. I wanted to check it out closer and got a stereo microscope (which turned out better than I expected). Then I decided I wanted to get a compound microscope also. I sold many telescope eyepieces to fund the microscopes. Coincidentally to our discussion, those eyepieces ranged from 100 degrees FOV down to 43 degrees (quite narrow). It's OK though because I still have way more eyepieces than I would likely need. I'm one of the few telescope observers who still doesn't mind using narrow FOV eyepieces. But I usually use those for planets (where they do a better job in my opinion).