First Timer, Wholesaler

[Beibei Lin]

After listening to the podcasts from BiggerPockets, I'm ready to find my first wholesaler deal. Before I get started, I have so many questions. If anyone can charm in and give me some insights. 

How to get multiple contracts to bid the rehab without being an annoyance to the seller for keep going back and forth into the property?

What happens if no one buys the house under contract?

What to ask when you return a call to a seller?

Allow inspection to a potential while UC?

Where to find lien and mortgage balance on a property?

What is the best strategy to coordinate with out-of-state owner to get in and out of their property freely?

What are some good criteria I should use when building a absentee owners/motivated seller list from Listsource?

How to find a owner or a property if it's vacant. 

Thanks