New to Forum

I am new here. I view my credit scores and my report. I checked off the items that I am going to dispute. How do I know when certain items will be removed from my report? I was reading some of the other forum and people were saying even if I pay the negative owed amounts on my report that my score may not raise.  How should I go about paying the items in full? Should I start with the least amount or greater amount? I am trying to get some help in how to raise my credit score.

Thanks