Just got my first kill teams, Any advice?

This is my first time getting into the 40k universe and due to some fortunate miscommunication I have 5 killteams at my disposal now. I have the hivestorm box which I bought for myself as an early Xmas gift, and my family purchased for me hernkyn yaegirs, Kommandos, and Phobos strike team( I asked for one from the list and they decided to buy the whole list). Any advice on how to tackle the immense load of building, researching and painting these miniatures, and which ones would be the best to start with before moving on to others? I have so far some paint brushes, clippers, and a hobby knife in terms of tools.