Right now, regular, quality content should be your main concern.
A medium to large articles every 2 days.
Also: FILL THOSE HEADLINE NAV ITEMS!
At the same time, build linnks. Start slowly, then get some services a few weeks in.
The integration with amazon sucks. Make it look like the rest of the pages, write unique descriptions for the items.
Best is a blog post every now and then for each supplement / book / whatever you are peddling.