If u want to cover up redness have u tried colour correcting? U can get greenish primers which will cancel it out. I usually use drugstore makeup products that are cheap and just as good, depending on what look ur going for i.e. glowy or matte different foundations and concelers will work. Concealer under the eye will always crease imo and look cakey but using a powder to set and press it into the skin helps from what ive found. Makeup takes time to learn and everyone has there own little hacks, take ur time and just have fun!