Why are you looking for people to collaborate and write articles for you when there's only 4-5 of your own articles right now? That's just silly.
There's next to nothing on the blog right now but you're already looking to outsource your blogging to someone else.
Unless you're going to pay people money, you need to build up your blog first (without spamming forums) before you look for guest writers.
Provide good value in the form of good information or entertainment and your blog will grow naturally.