Enjoy it. They are very simple, but excellent cameras. Take your time and think your way through the exposure process and you will do fine.
The simple meter readout is very easy to use. Centering the needle should put you exactly where the camera is suggesting you make your exposure. This works very well for most subjects, but once in a while you will have to make some adjustments. If you are shooting something against a bright background, and want your subject to show up as more than a black outline, then you will have to add in a little more light. Open your aperture or slow down your shutter until that needle just starts to move into the upper region. That will be about right and will give you a decent image. As an example, I take pictures of hummingbirds at the feeder against the sky. I open up my aperture about two stops more than the meter recommends so that I get a better shot of the hummingbird. Either that, or I use my flash for a little fill light, though that is a little tougher to do with the 1/60 shutter synch on the K1000.
The other thing I found a little challenging in the beginning was focusing. What helped me was to focus the lens on an object until I thought it was pretty close, read the distance off the lens, then pace it off to see how close I was. It didn't take too long before I trusted my focusing skills. It also helps to learn to pre-focus. I shoot my grandkids with manual focus all the time now but I do a lot of pre-focusing and then shooting the shot when they come into range.
Like I said, don't rush yourself in the beginning and you will eventually find yourself becoming pretty good at exposing and focusing your shots. I absolutely love that I am in total control of my images. One thing about it, when I focus now I know for sure what I was focusing on.