I NEED MAKEUP HELP PLEASE *several questions*

I have just started out really on doing makeup and trying to do more than just use primer and foundation 😂 Such as color correct, bake, etc. And I'm getting really frustrated and have several problems ... I would really appreciate if someone would help . My questions are :

1. I feel like my foundation looks splotchy/patchy kind of no matter how much I try and blend blend blend it it just doesn't look the same all over my face .. I use Maybelline fit me liquid foundation .. is there something I might be doing wrong ?

2. I have also recently tried to color correct my face ... NO COLOR GETS RID OF UNDER EYE CIRCLES !! They are blue/black and i've tried the purple & the yellow it does not work seriously.. when I color correct it also makes my skin peel a little (I have very dry skin) .. could that be because the product im using is a cheaper brand 😂 I bought the Ulta brand because it was the cheapest and I just wanted to try it out . So should I be using another color, another brand , both? Please help .

3. Is there anything else I can do to cover my bags ? I *tried* to color correct , use foundation , and put concealer on over that (maybelline age rewind concealer) and literally just nothing is working .

Please help in any way you can if I did not provide enough information for you to answer the questions feel free to ask me more about it and I will reply . Any help would be greatly appreciated .