A lot of people come to faith in Christ after a loving witness by a family, friend, co-worker, etc. or by studying the Bible and coming to faith after reading God's Word and it enters their heart and changes their lives. Sometimes God uses dreams to teach us things, and in your case, it would appear that this dream really shook your world and caused you to open your Heart to the Lord. I had a similar experience, but to a different dream. What's important is that we repent of our sins and believe in Jesus Christ alone for salvation, and live for Him. One thing you said really intrigued me.
african american man in a business suit...
In your dream, you remember this man, if I understand you correctly. As a young believer back in 99 I was street witnessing in downtown Minneapolis, and I was standing in an empty parking lot by myself when a man similar to the one you described walked up to me and encouraged me to witness, saying he wished more believers witnessed more often. When I went to ask him his name, he disappeared. While I've thought this was strange myself, I realize it most likely was an angel sent to encourage me at that particular moment. I haven't had really any other experiences like that, as I believe God wants my faith to rest in the Bible.
I want to extend a warm welcome to you and encourage you to watch the skies! God bless U
Fight the good fight of faith, lay hold on eternal life, whereunto thou art also called, and hast professed a good profession before many witnesses.
-1 Timothy 6:12