I started in L1 and got Willy Topp on a free, he got 42 goals. If you can get him then do. David Noble is an attacking mid who is injured for the first few months, you can sign him free after that. So too Rudi Skacel (LM), Oscar Diaz (AM RLC) and Alex (CB). Not sure if they will go so low as L2 though.
Definitely try and loan players in. I had Matty James, Corry Evans and Eikrem do really well for me in my two seasons in L1. In previous games I always tried to loan in a quick young striker like Plummer from Bristol City. They score a ton of goals in low leagues, I think having counter attack on helps too.