Several questions, first time buying ANY type of Real Estate

Hi everyone,

I've been around this site for almost 2 years now and I feel ready to make a purchase.  Before I do however, I am wondering if someone can answer a few questions for me, it would be greatly appreciated.  

1)  Once I've identified a property, what's the process for financing?  As in, do I need to talk to a lender first before I make an offer on the property? Or do I make an offer first then get the financing?  

2) Does this process in question 1 change whether or not if it's a SFR or a commercial property?

3)  I'll be investing out of state and I know property management is key, what type of questions should i ask the property management company?  What specific red flags should I look out for?

I'm sure I'll have more questions as I continue/explore this.  Thanks in advance for those who answer and of course any advice/insights/personal experience stories are welcome.