How to Estimate Financing Details When Analyzing a Deal

[Sarah Szuhay]

Hi all. I am new to this community and REI, so please be patient with my very beginner question :)

I am just starting to learn about analyzing deals and am not sure how to estimate my financing details when doing so, mainly length of loan and interest rate. How am I supposed to know what terms a lender will offer me? Do I need to secure a lender before analyzing deals? I'm also wondering if I should be looking at portfolio loans now or stick with conventional until I max out. 

Context: I am looking to do my first deal in Pittsburgh in the coming months. I'll have about $40k cash to put into it. I would prefer a turnkey vs a rehab since I'll be investing remotely. My credit score is just over the "excellent" threshold and I currently own one property which is the house I live in.

Thanks all, I would really appreciate any insight!