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Service seems good, can I try with a coupon if available?

How many unique domains will the 50 comments come from?

Adsense is not for you. Move on!

It depends upon what you targets are. News site backlinks are aimed at giving you a new stream of traffic.

For tier 1s, use PBNs or web2.0s that stick. Tier 2s use web2.0s and other public platforms and tier 3 use comments, guestbooks etc.

There is no overkill in SEO, and the keywords you may be targetting could well prove difficult to occupy the 1st position for. Do the usual SEO and you should be good. Make use of all types of links and monitor results.