Do I need more SEO stuff?

Hi, a few questions regarding SEO and Google. I currently use "WordPress SEO by Yoast" and try to make every post and every site go as "green" as possible. It works quite well. I also use Facebook, Twitter sharing and I have a newsletter widget to collect email adresses. I will also use Google Analytics. Do I need more SEO stuff or do I have to do anything more or is that enough? I´ve seen RSS-Feeds (what the hell is that?) and somewhere I can also type in search tags or search words in simple catch pro and some people also recommend to enhance the footer with some tags or links and whatnot... Do I need all this or am I already doing enough? And another question: I made a Google Analytics account yesterday. It doesn´t show anything yet which seems to be normal because it´s so new and my site is also not really open to the public yet (nobody knows about it yet). Do I need to install a Google Analytics Plugin or something or is the "external" Analytics account enough? Most of my blog posts I cannot find via google search. Only one of my 5 blog posts can be found. Do I have to do anything to tell google that I´m here (or that a new blog post is out) or does Simple Catch Pro tell Google everything on its own? Yesterday I made a new impressum with my name in it. When I google "my name impressum" nothings comes up. Again: Do I have to do anything or does google just take a few days to be up to date? Info: I have not shared my website or any of my blog posts yet. Maybe that´s the reason why google sometimes can´t find anything...