lets not get too harsh on the kid...............Hes just starting out.......we all make mistakes throughout and audio is an ever learning experience......I mean we are novices even after one year or years of knowledge........its always trial and error
Read about head units, speakers, component speakers, amplifiers 2 and 4 channel and subwoofers............see what specs you would like in one....construct a budget........but firstly look at head unit and speakers.........there are many available in the market
Pioneer, kenwood, Alpine all good and all have different characteristics..... But in the future try not to buy anything Chinese again except the food:)
and remember this quote :"In order to succeed you must fail so that you know not what to do next time"Anthony J.D. Angelo