Hello. I would like to become super rich someday. I have four business ideas that I think could be big hit. Some are new ideas, and some are just good opportunities. I have worked at a management consulting firm called McKinsey &Company for 5 years. I left the firm in hope to find job positions at a forunte 500, but I then wanted to start my own company.

1. A boardroom facility business. In these times, many small businesses are starting. They are also mostly homebased. But what happens when a home based business needs a meeting to promote something, meet with the board, etc. Home based businesses simply cannot have professional meetings within their own home. Before launching the business, I would buy real estate in convenient locations. I would then build the center up with boardrooms, secretary services, offices, printers, fax machines, Internet, laptops, projectors, Catering services, and all business needs. Due to limited amount of space, businesses would book ahead. They would pay a fee depending on how long they use the facility. Startup costs could be 50k to sig figures, however, I have saved tons of money from being a management consultant, and I could get investors in on the startup. If the first center is a success, I could open up locations in other cities and eventually become a franchise. Good idea?

2. I would start a consulting firm that consults website owners and online business owners of the quality of their online presence. We would advise small web based startups on what problems they should fix and how they should go about achieving success. I would most likely partner this business startup. We would hire consulting professionals who have experience in the web based industry.

3. A website where people can buy and sell businesses. Currently, there are tons of sites that do this, but a seller of a business would pay a fee to post. Then they could sell there business. However, legal problems may cause an issue.

4. I would start a venture capital/private equity firm that invests in early stage web startups.
I have some experience instwrting business. When I was 22, I started a service called the love van. I bought a van, fixed it up. It was a van where people could use to make love in the back room. The van had privace, included wine, beds, condoms, etc. I would drive lovers all around town for hours. It was a cool business, but not too profitable. Which business idea should I pick? I like the board room space company the best..

The board room idea is not bad, although I would be worried that you pay costs even for the down time.
I would suggest you try to maximize the uses. When you have not got board meetings do wedding receptions, private parties, seminars, anything that will use all your facilities. This could go into weekend use as well.
Do not get tied up in the side lines like catering and cleaning, sub it all out. Create an identity, a mark if you like so that your parties/ your place is recognized . If it works you are not tied up and you can open the second.

50% of ten businesses is better than 100% of one!