HI Stacy,
Dayton Ohio here!
I know the amount of information about SEO can be overwhelming; some of it which still ranks well is outdated...FRUSTRATING!
Any advice I can give will be tailored by my past experience, as I would assume most of everybody else’s will be as well.
To start with there are basically 4 things I will touch on.
1.) Your website.
Are you building it by hand?
Or are you using a CMS (Content Management System); WordPress, Blogroll, Joomla...?
This is an important decision to make. Each pre-built CMS system has some perks and disadvantages. Most are simple to get published but maybe more popular targets for hackers simply due to the platform's popularity. Even with decent web designer skills they can present a challenge to get past the learning curve to do any personal customization.
If you are building your own site, you may have a lot of work ahead of you in non SEO related categories. Depending on your design and coding skills this may not be a huge hurdle.
Either option is valid. But you'll want to fully familiarize yourself with the platform you choose and its SEO's effectiveness.
2.) Know the basics (Moz Guide To The Basics)
When building a site, or choosing a platform you'll want a firm understanding of these concepts. If choosing a platform these will allow you to adequately evaluate each one. If building your own site you can easily write the content with the basics in mind.
3.) Mobile Friendly is a must for new sites
The amount of people using tablets, and mobile devices is only going to go up each year. If you are starting a new site ensure your content is mobile friendly. Established websites may get a little leeway due to the amount of authority they have built up in the years before you, but starting out better than them is important. This year Google starting differentiating mobile search results based on their mobile friendliness.
Read:
9 This You need To Know About Google's Mobile Friendly Update
Basic Mobile Optimization
Responsive Web Design
4.) Content is Key
Having the best content for your industry is key to top search results. You may be able to take a good content approach at first to target long-tail, niche market keywords, but your end goal should be the best content. This is one of the most important aspects not oft talked about in SEO. You can have a great page with all the right SEO practices and never see page one search results. This is because you when you're on the internet you are competing with everybody in your industry. First page results = money for just about every industry!
If you don't bother with any links I posted here, please at least watch Rand Fishkin's Whiteboard Friday on Good Unique Content Needs To Die
To answer your question about picking keywords, while this is an important process and though long tail keywords may not bring a lot of traffic they will bring in the right traffic if all is done correctly you can start ranking for broader keywords, even without trying!
In summary, know the basics, and understand why mobile optimization is important, this will help you choose your design platform and finally remember writing the best content is one of the most important things you can do.
I really hope this helps,
Don