It really depends on the vodka. If you dont wanna taste anything of the alcohol, mix it with sparkling water/ginger ale and add some fresh lime juice.
Other that that, you can basically mix it with any juice or softdrink , including energydrinks.
Even if it might sound weird, I sometimes like to drink it with coke.
So basically, as some other people said before, you can basically go with anything you want to. For starters, you can start with a mix of about 30/70 - 40/60, when I am using limejuice, I usually do 50/50.
Have a nice evening!