@Account Closed looks great!
1. The Real Spaces theme is a good theme with good support from the developer so you should be fine using this for yourself or future sites you may build.
2. Adding your actual email address to the header or anywhere else on the site usually leads to a lot of spam, you can test this to see how things go but you may find yourself wanting to link this to an actual contact form with Captcha. Wordpress is an amazing platform but its popularity brings on a ton of spam so this is one thing you can change to stop "most" of it.
3. Business News is a great idea and I know this is a mock site but eventually if you can get real content in there rather than the feeds, this will have huge benefits from an SEO standpoint. The feeds you have now are great for a temporary solution but start building some unique content on this domain sooner rather than later and you will start gaining credibility with the search engines. If you plan on building sites for others, finding a good writer may be a good idea. This will establish each site as a thought-leader in the search engines eyes. If you can provide this for your clients, this will create huge value.