Finding a Lender in multiple States

[Stanley Luo]

I'm planning on doing out-of-state real estate investing and I'm currently reading David Greene's book.  

I'm curious about finding lenders in multiple states I'm interested in investing in.  Should I be finding lenders in multiple states at the same time and also if I remember correctly, there's a certain time window I can have my credit pulled multiple times without it affecting my credit score?