Hi there
No-one's going to bully you; we were all newbs once, buddy x
Are you sure your fish have ich? Ich looks like very bright white, raised dots, all over the fish; almost like it's been sprinkled with salt. Normally we recommend salt and/or heat as the best treatment for tropical, but I'm not sure the danios and goldfish, which are really temperate fish (that means they do best in tanks without a heater), will survive the higher temperatures. You might have to look at using a medication, if they do have ich.
I do feel I have to tell you that your fish are not going to live long healthy lives, if you keep them together. Some of your fish are quite aggressive and might bully, or even kill the others. Some of your fish need warm water, and some do better with it cooler, and you don';t have enough tetras to make a proper shoal; that could lead to them getting very nippy towards the other fish.
The stress of being in less than perfect conditions is going to be a factor in them getting sick; nearly all fish diseases have an environmental element to them; even if it's just that weak fish are more liable to catch something.
Can I ask how big your tank is, what temperature the water is and how long it's been set up?