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Your question is saying the answer.... on page.. changes on the website or page...
off page.... back end of the website

all off page promotions like DIRs, AR, PR, SBMs, commenting, profile creations, forum postings, blog postings comes under link building. These all are effective ways of link building

Some forums accept BB code link HostSearch Forums and some forums accept anchor text ahref code as you mentioned above.

Website hosting will depends on website content??
I think it's depend only on website platform like Asp, php, linux, windows and bandwidth.

How frequently we want to rotate anchor text for off page promotions. Doing off page for a sing keyword is good?

http://www.texas-defensivedriving-online.com

do all promotions, rotate your keywords when you are doing off page. Rotate your promotions also

http://www.dmv-practice-test.com

1.Google
2.Yahoo
3.Bing

Submit your site to fast crawling sites like amplify.com, clipmarks.com and you may tweet your url in Twitter. 100% it will work.