1. Show the track record. Track record for real estate investment in Ghana. Your own track record - how well you've done over the years. No overseas investor will invest without seeing these 2 things.
2. Tell how you'll be dealing with the local Government issues. Any red tape.
3. First focus on folks who were from Ghana but have now left the country. These are people who are easier to convince to invest in Ghana.
To give you an idea about the kind of information investors will require, take a look at:
http://dholerasir.com/
Thats a website setup by a friend who is developing a township in Gujarat, India - and is looking for investors.