I agree with Alex that should aim for 300-500 pages in the long-run, there's no rush though, I'm talking within 3-4 years. If you can find 150-200 GREAT keywords then you can probably start your building!
90802, picking Tier 3s for Tier 2s I just pick the most relevant keywords that are under 100 supply and over 200ish demand. I also encourage you to brainstorm other words or synonyms to your Tier 2, you might find some pretty interesting keywords.
I myself like to outline my whole site (or at least about 200 pages) before I start building, that way I have to brainstorm and make sure I have profitable keywords because it would suck getting stuck at 100ish keywords when you've been building your site for a year and discover that there's nowhere to go (not that a 100 site can't be successful, of course it can!).
There are lots of problems you can run in to, for example you might have so many similar keywords that your site will look weird if you use them all. You might discover that your keywords weren't so good after all. That is why I like laying it all out, this forces me to see if it will work or not.
Tips for finding keywords: Look at competitors, think of words or phrases your visitors might choose, think about similar words (cars vs automobile for example), use different forms (combining vs combination).
Again.. You don't need to have 500+ pages, this might feel overwhelming, so just plan those initial 150-200 good keywords. If you have that, you are ready to start building. When you're done with those, you can build some more content or do whatever you like, you will get good traffic IF your keywords are good, content is good and links are good. The better your keywords the less links you need.
Hope this helps!
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