Traffic patterns can have a big impact on wher eou build.. and what you build. It's not a badidea to see if you can find a good long term anchor tenant before you start.. A good mix of tenants is also important. There area lot of factors involved so be sure that you get as much information as possible befor you buy the land and certainly before you build.
This is such a large financial decision, you are going to want to do your homework, take a class, hire a professional, whatever it takes to make sure you are making a sound investment.
Good luck to you! ~Kathleen