Hope someone could help me

hi, i am learning how to use AI but I am finding it very difficult.
I would like to apply some changes to my LOGO and I need your help,I am not asking for you to do it for me (this is not the right way to learn)a tutorial woul be useful or maybe a step by step.
what i would like to do is very simple,i would like just to change the colours and maybe the writing,shades etc etc.
do you think this is possible to do?

thank you for all the suggestions.

by the way,the file is: flat vector jpg

regards
thomas