It may seem obvious, but the best way to get started in marketing is to be bold and make changes that are going to yield big results. You can refine later as you start to learn the why of marketing.
The reasons for this are numerous. If you are just starting out, you may be lacking site traffic. So if you dive into nuance and detail, you will likely not know whether your efforts are bearing fruit or withering on the vine. The pre-cursor of any new change, should be the ability to track your changes and know whether your changes are effective.
Driving new traffic can be a tremendous challenge that is not easily solved by a single solution. Likewise, content creation is a beast that will constantly eat your free time if you let it.