Question about how a blog hosted on my web site, might compete with my home page listing in search engines

Hello,

I have an excellent listing in Google for my targeted search terms. Now I want to have a blog on my web site, which will end up using my search tems far more often than my home page does, and I am concerned that when people type in my search terms into Google, the blog will receive a more prominent indexing or rating than my home page has, and people will be taken to the blog instead of the home page. I don't know how big of a deal this is, it's just something that came to me and concerns me. I realize that I have some fundamental misunderstandings about how my site and the blog would interrelate, hence my confustion and question.

I am selling a product and that product is most prominently advertised on my home page. The blog will be about things that are directly related to the product, so that's all good, but as I stated, I don't want to detract from how well my home page is listed... Hopefully I am making sense and you can provide some advice. It is a Word Press blog that I have loaded but have not put into use yet. I have never setup or used a blog, so I am quite ignorant about it.

Thank you,
Riverwalk