Internet Marketing is a very broad subject and there are many ways to learn about it. One way is to take a class at your local college or university. Most schools now offer at least a basic course in their business schools.

Another way is to search for forums on internet marketing. The warrior forum comes to mind. There are a lot of smart marketers there with very good ideas on making money online.

To really succeed though, you will have to decide on what your business will be selling, because that’s what it is all about, selling and making money, at least in the beginning.

After having a significant amount of success, most marketers go into teaching to help others out, while at the same time making even more money from their home study courses.

There are many more ways to learn about this, but forums is a very good start.

Hope this helps.
References :

I would also recommend signing up for a few blogs on your blog reader: Aaron Wall, Seth Godin (the godfather of internet marketing), and Duct Tape Marketing (really good for small biz). If you like paper-based knowledge, the free (4x/yr) Website Magazine has some excellent articles.

If you are looking specifically at internet marketing for manufacturing, my blog is listed at the bottom of the resources. It has articles/tips that are free with fairly good detail.

Hope your internet marketing goes well.
References :
http://www.quirk.biz/emarketingtextbook/download – the free book on internet marketing. Best free resource I’ve found.
http://www.seobook.com/blog – Aaron Wall
http://sethgodin.typepad.com/ – Seth Godin’s blog
http://www.ducttapemarketing.com/blog/ – Duct Tape Marketing
https://www.websitemagazine.com/scripts/sub/subscribe_level.aspx – Choose standard for free 4 issues/yr
http://www.marketingformanufacturing.com/marketing-tips-for-manufacturing/ – my blog