Help with combos and mix-ups

I’m new to this game and I need some mix-ups and some combos to help me. I’m a bit confused when I see threads posting about combos because I don’t know which combo to use considering there are 10 combos for 1 move and not going into any detail about what is better to use in what situation besides the obvious meter cost. And I need to know mix-ups because I use mix-ups a lot in my game (The first fighting game I got into was Soul Calibur and that’s a mix-up heavy game) and I also use use distancing and I heard Ken is good with both so I picked him. Can anyone help?