Sorry for the barrage of information. The fact of the matter is that there is no consensus for what supplemental materials should be used--if any. Personally, I found E&E helpful for civ pro, torts and contracts, others, like YellowBrickRoad, recommend something called CALI (which I am not familiar with) and do not particularly value E&E. I did not use commercial outlines because I preferred briefing cases myself. I felt that it forced me to understand the cases individually. But I know plenty of people who swear by them. Similarly, even if you use E&Es or Gilberts, don't use them as a crutch. They're called supplements for a reason.
Also, I would suggest that you not overload on supplements at the beginning. You will already have enough reading to do. After a month or so, evaluate your understanding of the material. If you feel that your understanding is lacking, purchase one supplement for each class. Again, E&E's were my preference but that perspective is far from ubiquitous.
Finally, to reiterate, relax over the summer. Read the relevant parts of LSC. The book covers all three years and I don't recommend jumping ahead--it caused me a lot of anxiety.