I think you need to ask yourself `What do I need a partner for?"
The best partnerships work becuase the abilities of one partner are complemented by the abilities of the other partner. So if you recognize there are areas of business and/or real estate that you need some assistance, it would be beneficial to partner with someone who has those skills or abilities already.
I worked with a partner from the start when investing. I live in BC, my partner lives in Alberta. I took on the responsiblities of the financial side, and he is responsible for the hands on side of property management. To date, it has worked really well and we managed to make it further than I think we would have if we went at it alone.