Viewing and buying rental properties: how do I start?

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Hi all! I fell off the grid and a bit into the analysis paralysis but... think I am ready to truly move. I am aiming for rental properties and would appreciate opinions! 

Here are my questions:

1. Do I use my usual real estate agent to look at rental properties or are there ones specializing in investment properties?

2. I may have asked this before in different words but what are my options for buying/financing without having the necessary amount for down payment? Is it an option to buy rental properties with OPM? If yes, how does it work with paying that money back if all I get is a rent and not a bulk amount from buying/re-selling/flipping?

3. Is it a good idea to buy a cheaper property requiring half of what I have available for a down payment which may however not allow enough left over money for a down payment for a second property? 

4. If I decide to buy rental property(ies) as an LLC, what type of professional(s) do I need to involve/reach out to?