I know its possible to make serious money online, but for now I need to keep my day job. I am wondering where I can study Online Marketing? any suggestions?

There is not a set way common for everyone.

Start with Google webmaster official blogs and participate productively in reputed forums like webmasterworld.

People who have been in your shoes are kinder when they see sincerity and are open to guiding you down the right path.

Learning the basics is easy from forums like above or blogs like :

searchengineland.com

seomoz.org

seobook.com

toprankblog.com

etc; it is the practice that takes years in perfecting your skills.

And sorry to disappoint you but studying online marketing does not necessarily equals becoming a millionaire.

Best wishes for your success.

Hope this helps.

P.S: If you find the answer useful, please don’t forget to vote!

Best,
OMZen