so frustrated

i am really new to this, i am not a computer programmer nor do i have a PHD. I am really really struggling with all of this to be honest. I have installed your plugins and my website is still as slow as ever and i still cannot get listed on Google for any of the products that i am selling. No one can find my website what so ever. I have been launched for a few weeks now and had around 4 visitors and sold no products. I am so over whelmed with it all and I don't know what to do next or why nothing is improving.