ill send you some basics later that i use, i have to go work right now

Perfect, sounds good really, to know how to use a camera in manual mode is to really understand photography and the tools and variables that you have at your disposal to affect the final result of the photograph. Basically there are three values or variables that you have to learn, I'll try to give you a brief explanation and to make it similar to how our vision works through the human eye ;)

- Shutter speed: The cameras have a sensor if it is digital and a film if it is analogical, this is the support on which the light hits and leaves 'recorded' the image. The shutter speed controls the time that the sensor or film is exposed to light. Think of it as a curtain that opens for the time you set, normally the shutter speed is measured in seconds and fractions of a second, for example 1/1000 would mean that the sensor is exposed to light for a millisecond. If we compare it to a human eye this could be the speed at which we blink.

-Diaphragm aperture: In addition to the shutter, cameras have a diaphragm, which is a system that lets more or less light into the sensor, like the pupils of an eye that become small or large depending on the amount of light. It is measured with the number f/ and basically indicates how closed or open the aperture is, it works like this for example f/2.8 is an open aperture, and f/16 for example is a more closed aperture.

-ISO: this value indicates the sensitivity of the sensor or film in your camera, the higher the number the more sensitive to light the sensor or film is, also the more sensitive it is, the more noise you will have in the picture, for example iso100 is a low sensitive iso, suitable for scenes with a lot of light, for example a sunny day, and an iso1600 for example is much more sensitive and is more suitable for night or low light scenes.

Basically if you understand these three values and how they relate to each other, you understand photography and you can use the camera in manual to take pictures the way you want and find the result you want.

Lastly, there is an element in the camera called a light meter and it basically gives you a scale of whether the photo is well exposed, overexposed (very white or bright photo), or underexposed (very dark photo). This meter gives you the exposure reading based on the shutter speed, aperture and iso that you have set on your camera.

... I know I have given you a lot of info, but if you understand these concepts you can deal with any camera, digital, analog or whatever hahaha they are the basic principles of photography. On the internet there are many resources to learn, I can also recommend you books