Affiliate Marketing Secrets

When you put an affiliate link onto your site, do you incur any expenses by leading the user to that site? Google and Linkshare in general.
Be nice to know if I am planning on building a directory with over 500 affiliate links.

I am a full time employee. As a hobby I’ve started creating web pages on free platforms (free hosting and free sub-domain); those pages also include affiliate links from Amazon or eBay. Let’s say I will, at some point, make £20 per year. Do I have to declare myself self employed, start filling in self assessment forms and pay tax to Inland Revenue for £20 of additional earnings (on top of my annual salary)?
If not, being a negligible amount, then what is the threshold (if any) above which you have to declare yourself self-employed and start paying taxes? If there is no exact threshold, does this mean that the Inland Revenue is expecting getting taxes from (let’s say) a person that makes online a £1 profit (paid into his bank account) from selling one item on eBay?
Thank you.

Thanks. Hope you help. God bless.

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*A habitat is the student’s house, while her niche is the activities that she partakes in within her house.
*A habitat is the role the student occupies within her neighborhood, while her niche is her community.
*A habitat is the student’s role within her family, while her niche is her family’s role in the neighborhood.
*A habitat is the student’s neighborhood, while her niche is her family.

From the sixteenth to the early nineteenth centuries, Westerners were interested in Chinese markets chiefly
a. to acquire larger amounts of Chinese manufactured goods.
b. to acquire raw materials and cheap labor.
c. to sell cheap goods to the masses.
d. to gain access to China’s technological secrets.