They can guide you through the specific zoning laws and regulations for each city you’re considering.

FinCEN’s Small Entity Compliance Guide walks small businesses through the requirements in plain language.

I would use the self-reported credit score and income as an initial guide, but definitely get an actual credit report and verify income with employer. 

Gave that context as I have that as experience to guide me this time.

The agreement would outline how profits, losses, and ownership interests should be divided, which will guide how you allocate the gains.  

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.

Start with BiggerPockets Ultimate Beginners Guide (free).

This analysis will actually help you determine how much cash you need for your first deal which will guide your decision for a well paying facilities job.  

I've had negative experiences with a bad general contractor and a non-paying renter (leading to an eviction), so I'm being extra cautious in selecting the right lender this time.Could anyone recommend a trustworthy lender in the Los Angeles area who can guide me through this difficult time?

Start by reading the Ultimate Real Estate Investing Guide: https://www.biggerpockets.com/guides/ultimate-real-estate-investing-guide/introduction2.