According to many financial experts, investing your money in commercial real estate is a good investment but there are still guides of doing it. Here are just a short summary.

Spread the investment and choose it wisely. It is better to put small amounts separately.
Study the market trend is very important. Never forget to do it.
Study the property. Check everything like condition, ownership, value and zoning.
There are cost that need to be calculate like taxes, insurances to pay and also maintenance cost.
Prepare the professional documents of property and calculate also about the cost and projections.
Sometime the investment involves loan. Choose carefully which loan you want to take and make sure it is affordable.