@Jordan A Bradley Welcome to bigger pockets!
I will go down and answer some of your questions as well. Some of which may echo Luka.
1. Zillow is definitely not always accurate and the best and most accurate way of running comps is through the MLS. That being said, pretty sure you can get MLS access without an agent, but if your time and travel will limit you, it may be best to have an agent run comps for you.
2. I will address and agree/disagree with Luka on a few points here. Auctions are definitely a great way to get yourself in some problem properties especially with title/lien issues. You would rather have structural home issues/ tenant problems, etc. than deal with title issues, ask anyone that has been through it. Bandit signs can be a decent resource, but like Luka said you need to do a ton of them. Better option there is door knocking and creating a systematic attach and approach. The key is consistency and persistency in anything you are doing, kind of like music. Door knocking is cheap and so are mailers if you are focused and deliberate in your attack. Lastly, if you do not have the time or resources to do either, than buying steep discounts from the MLS and wholesalers are your best options. There are deals out there and they are on the MLS sometimes in plain sight and in wholesalers inventories. I say loosely "deals" because everyone has a different tolerance level than others when it comes to investing. Some 60% of the resale value others its 80%. Know your budget and the costs associated. Get connected and get plugged into properties. It does not cost you anything to know what is out there, whether you actually purchase it or not.
3. Agree with Luka, not necessarily, but you can do a double close and I would recommend asking an attorney on that.
4. There is not trick. You have to stay on top of them.
Hope that helps. Look forward to helping any way I can.