I have an old Mr. Coffee machine that I bought ages ago, when the roommate who owned the coffee machine moved out. The brew interrupter doohicky broke at some point, so I removed it, and I've had to fiddle with one of the plastic tubes (which came loose at some point). I use it because I know exactly how much grounds to put in for a given amount of water, so it works just great.
Honestly, I've never seen much use for the fancy-shmancy coffee makers. Sure, they've got timers and digital displays and whatnot, but at the end of the day, all you're doing is combining an amount of water, heated into steam, over an amount of coffee grounds and letting the water drain down into a pot. The more controls they put on a coffee machine, the more likely it'll do something "automatically" that I don't like and which makes the coffee taste bad.
Have a friend with one of those monster systems, that'll make 8 different types of coffee/espresso/whatever, in any of a variety of ways, from a single cup, two cups, etc. I remember him offering to make me a cup of coffee and watching him spend like 5 minutes fiddling with controls. Finally a single cup of coffee comes out. Sorry. That's waaaaaaaay too much effort to make coffee...
As the the question at hand? Thumb. Make sure the machine is clean. Run water through it without any coffee. It should come out as water. If there are grounds in there, take off the section where the grounds go and clean it out completely.
Definitely get the correct sized filters. They should fit perfectly inside the holder, maybe a quarter of an inch from the top edge. There are a whole bunch of different sizes. Also, they can come in either cone or flat shapes. Make sure you get the correct one for your machine. At that point, it should just be a matter of getting the right mix of grounds for the amount of water. Get in the habit of always filling the container to the correct height. Don't use any measuring thing on the container itself though. Put water into the coffee pot itself, up to a set mark, then pour it into the machine. Put a set amount of grounds into the filter. Close it up, and turn the thing on.
Experiment with the amount of grounds until you get the coffee right.
If the coffee maker is just plain broken, then get a new one. You don't need an expensive one. Usually, if the machine is broken (and there's only a couple things that can actually break), it'll either just not brew at all (element is broken), water will pour out the sides/bottom (tube came out somewhere), or the coffee will overflow the top of the filter/grounds part (valve at the bottom got stuck). If it's flowing properly out of the filter part into the pot, then the coffee machine is working, and you just need to clean it and find the wright combination of grounds to water.
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