WordPress Help and SEO SEM

We are a small company that specializes in early childhood education products that we create ourselves. Our videos alone have nearly 9 million views on youtube and grows each month. We have an old website created in 2003 that is long in the tooth. After a lot of research, I decided to take wordpress, learn it as much as I could and develop a new site using a new web address. I have the basic website built and using PayPal. The old site for comparison is Right now my site is not optimized for anything because I have no real idea how to do it, but I know it is not good right now. Images need to be optimized, which I didn’t know about, but found out about a plugin that will do it easily I am told, but am afraid to do it. I have jetpack installed, but not activated because am not sure what all to do with it. I do have Google analytics account, but don’t know how to connect our site to everything. I am hosted by [login to view URL], so I am a [login to view URL] and have filezilla. In any case, we are a niche products company that appeals to new mothers, early childhood educators, grandparents, and children with autism. That is the market we want to attract, and I have lots of keywords that have been researched and can be used. I don’t think we need lots of traffic as much as the right customer traffic, but with that being said, I know very little about the whole process and need help.