2006 Chevrolet Trailblazer problem code numbers

Question

I have visited mechanic for a general service, so he came up with big list of issues to be solved, i need guidance to prioritize this list to do one by one, since i dont have sum of money i cant to do everything at once, kindly guide me which i should go first and important to solve the issue, kindly suggest me the parts which is cheap and best possible, i have seen some of the parts from "AcDelco", "Detroit" brands, it that okay if i use these products to replace ? because where i live they only sale GM products which is very high cost, i dont afford for that i need alternative, kindly help me out in this please, i have attached the image of the list of problems i have in my car.
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