Tier2 links are very important to pass good link juice to tier1 links which in turn will pass link juice to your money site and help in
getting better rankings for your site.
12,000 to 200,000 Tier 2 links depending on your budget, links will be 80% dofollow and mix platform
Links will be from
1. Forum profiles
2. blog comments
3. Guestbooks
4. Image comments
5. url shorteners
6. Microblogging sites
7. Article sites
and other plaforms
Just need list of your tier1 links to build tier 2 links to. List that you
provide can have any number of links ,keywords but i would suggest
keeping it below 500.