From what I’ve seen, firms like Exeter 1031 Exchange or Asset Preservation, Inc. have solid reputations for guiding investors through the process efficiently.

If you know of any online forums or organizations where I can learn from others and expand my network and knowledge on wholesaling or getting my first deal, I’d really appreciate any recommendations Thanks in advance for your help!

When the date came he said he wasn't going to submit it by the online app (stipulated in the lease) but would have it in cash and that we could come pick it up (we live 3 hours away). 

If you have a good relationship with a lender who has a track record of great customer service and hitting all deadlines, even better if they have a good local reputation with the listing agents in the market that you do business in, then that’s worth more than the promise of a slightly lower rate from an untested lender IMO. 

-I'm fairly careful with communication , but again, I know doing business online is way riskier, but I want to ask: Typically, I would trust someone who seems very in-depth, informative (gives statistics and numbers), and basically would give me thorough steps (including worst-case scenarios and what would best fit my situation)^^would people who have experience say that even with the above, some agents/lenders/PMs would still be sort of out to get your money and do a lousy job?

If you want to put the deposit in a out of state/online bank, then you will have to furnish a bond.  

You can also check their reviews online at Google, Facebook, or Yelp.

To managed it a bit easier (when you grow to more than a dozen), it'll be better to have one online login and manage all 'child' accounts.

Their demonstrated experience and reputation in the industry will speak volumes.  

In Land Investing Online there is a free support group as well as an affordable monthly subscription (I think $100) where you can share your deals for input from the other members.