@Kris Spevak - @David Dachtera gave a lot of great advice. Really well said. Obviously coming from someone who has real experience and wisdom. Two things I would clarify from his post.
One, one of the golden rules in real estate is to not ever take title or transfer title of a property into an S-Corp or S-elected LLC. It is fine going into that entity and while its there by not good when that property comes out of that corporation. This just follows the general rule of not owning properties in corporations and it has everything to do with the way it is taxed when it is transferred out of the entity. Do use that S-elected LLC or S-Corp for any active income such as flipping or wholesaling you may do and get the salary/dividend split David mentioned.
Your trust will have to have special language to be an owner in your S-corp because only natural persons or human beings can typically be owners in S-Corps.
This leads to my second clarification. The LLC cannot be a part owner of the S-Corp because of what I just mentioned above. But, a trust or another LLC can be.
My suggestion to avoid this issue with the S-Corp is to actually have two LLCs. One should check the box for being taxed as an S-Corp, which then is taxed as an S-Corp but has the flexibility of ownership that the LLC has. I would do this only if you are making more than $40k per year as a flipper/wholesaler where you are earning active income and can get the benefits David mentioned. The second LLC should choose taxation as a partnership. It then becomes the LLC that holds your rentals for the passive side of the tax benefits and the asset protection for that property. I would use this same entity for the first couple of flips even just to keep it simple.
You will likely have to purchase these properties in your personal name and then if you decide to keep it you will transfer it into your LLC.