Marketing strategy for T-shirt Quilt - PPC campaign plan / E-mail marketing plan

My company is in its fourth year. Although, I am using Facebook and Instagram, I know that I am only scratching the surface with how I can use these platforms. I have a website which is my main marketing platform. I would like to build up my email list and have a solid marketing plan in which to execute. I would also like to have a plan to optimize SEO. Basically, I am open to suggestions for strategies and ideas. Marketing is not my strong point.