A few top-of-head thoughts. First, from the attorney's standpoint, it is usually helpful if the client is prepared. Be sure that you have all of the information that the attorney may need, including the names, addresses, and contact information of everyone involved and any deeds to any property that may be involved. Have a list of your concerns and goals and be ready to discuss them.
You will also want to be sure that the attorney understands this area of the law inside and out. You will need to form at least one entity (probably an LLC), maybe more. From a legal standpoint, there are two types of liabilities to be concerned about. First, there is your personal liability for any judgments against the LLC (inside liability). You want to be sure that you have a rock-solid LLC agreement in place for each LLC that you form. As importantly, you will want to understand how to operate the LLC on a day-to-day basis (avoid commingling funds, execute contracts in the name of the LLC, etc.). This will help ensure that you're not personally liable for any obligations or liabilities of the LLC.
The second type of liability is outside liability. This has to do with protecting the assets of the LLC against any claims that may be made against you, personally. This will involve charging order protection. You will want to be sure that the attorney understands charging order protection and knows whether it will apply to single-member LLCs in your jurisdiction. Otherwise, you may need to either (a) form the LLC in another jurisdiction or (b) add multiple owners.
You will also want to think about how the business structure fits into your estate plan. Is there a succession/exit strategy in place? Depending on your asset profile, an asset protection trust could add another layer of protection.
You will also want to be sure that the entity is tax-efficient. The attorney should understand the tax implications of the various classifications available to LLCs under the check-the-box regulations. It is likely that the LLC will either be a disregarded entity (if you are the only owner) or taxed as a partnership (if there are multiple owners). Your attorney should be able to explain this to you and discuss the pros and cons of each option.
Above all, be sure that you are comfortable with the attorney's expertise. Unlike the medical profession (where professionals must go through rigorous, hands-on training to be considered a specialist), there is often nothing from preventing an attorney from claiming to be a "business lawyer" when he or she actually has very little experience in the area. It always rankles me to see an attorney advertise as, for example, a personal injury lawyer and a sophisticated business lawyer and a DUI lawyer. In my opinion, it is not possible to have deep expertise in that may diverse areas of the law. You should be sure that your attorney devotes a substantial portion of his or her practice to real estate/business law and asset protection.
I hope that helps.