Here is a good place! Be sure to take the University courses you can access and maybe the Foundations training.
You can also visit my site: marketingrockstarguides.com for practical advice.
The certification itself is pretty easy if you have 6-12 months of on hands experience. There is a page for example questions if you do a search for "marketo certification"
After you have done this course I would recommend going to the UNIVERSITY section of the community, and regostering for the on demand BEYOND BASICS course and doing the mobules in yellow below. Forms 2.0 is a must, and the Email Editor, then the rest you can work your way through as and when:
Hope that helps.
A
Anonymous
February 5, 2015
I started the online training today which have been useful especially the ones that let you do it alongside the video. Be aware that they are in alphabetical order as opposed to in the relevant training order!