Nailing down the numbers

[Konrad R.]

I'm just starting out. I'm looking to get into rental properties and flipping. I purchased the bigger pockets book on the latter from amazon. I want to get me numbers as close as possible when I do analysis on potential properties. Do you have any recommendations on content I can read (i.e. websites, books, etc.)? 

I'm trying to evaluate a couple of rental properties right now. I've been using the 50 percent rule and then going a little deeper if the numbers looks good. I just don't want to miss anything. 

I haven't really gotten into financing properties yet. I'm going to start by doing cash purchases (some will be 1031).