Not sure what the laws are in Sacramento, but I would start with a few general tips that are always helpful - keep anything you have in writing (especially your notice to vacate + any response, and any communication around the new tenant).

Either Im not communicating what I want well enough. orHe doesn't want to filter results from the MLS manually, if hes saying hes sending only based on price + area right?  

It gives the owner an opportunity to question everything and you'll be on the phone or writing emails explaining/justifying charges.If you're honest, communicate well, and educate your owners in advance, they will trust your statements.

This will hopefully be the last communication before an accepted offer.

I am planning on majoring in Business or Communication in college.

Due to the fact the roommate has been living there for so long, does not have a lease and doesn't pay rent, I am asking for a few tips to give her in regards to the eviction process and making it as efficient as possible.

Good: You could create some management efficiencies.

Was I wrong for communicating Selling agent who originally contacted me, even thought I passed on the deal?

It seems it would be a very useful app for meeting and communicating with potential clients. 

BUT as mentioned above, communication is the real answer.