It's great that at least you understand what your real dream or ambition is. Many people never get that far. I am a musician, too, but never got into the mixing/mastering side, just some minor editing on occasion. What kind of equipiment do you have?
-I have a 2012 macbook pro but it's still proving useful and reliable for what I need.
-I use the DAW (digital audio workstation) software Logic Pro X on that computer. Once you start to overcome the learning curves, it's a powerful, intuitive program. I use it for recording, mixing, and am in the process of learning to master with it.
-I have a set of studio monitor headphones (I can't remember the brand, but they're about low to mid range as far as pricing is concerned, but get the job done). Monitor AKA studio headphones and speakers are designed to provide a flat sound without any added effects or sweetening, whereas most commercially available headphones are designed to accentuate the music and don't provide accurate audio for the producer (I once tried to mix a track using my Bose headphones and while it sounded phenomenal played back on the Bose, it sounded like shit on other speakers. I went back and mixed it with my monitor headphones and got it sounding good in my car, on my Bose headphones, and decent on a small phone speaker).
-I own a Korg midi controller keyboard (37 keys) and an Akai Mini MPK II. The Korg is preferred for composing and playing synth parts. I usually design beats and percussion with the Akai because it has a drum pad on it. All of the "instruments" in the music I'm currently working on are synth "voices" played with either of these keyboards. The Akai is also good for working with samples but I don't work with any samples currently--too much headache when you're working with others' sounds and run the risk of being sued.
-I have some guitars but haven't been using them much lately. I am actually out of practice as a performing musician, but most of what I currently do involves playing on keyboards, then rearranging or refining the individual instruments and parts in the DAW -- every "instrument" is recorded in its own track, the same as multitrack recording in most music production, except I'm working with audio generated as MIDI rather than sounds recorded from "live" instruments. But I would like to start incorporating more live instruments like guitar, etc into my recordings in the future.
Not sure if I forgot something but that covers the basics in my home studio. It's very lite at the moment and nowhere near as nice as some of the home studios I see in youtube videos, but it serves my needs.