Affiliate Marketing Secrets

I need my 10 yr old tb out on loan (personal reasons) but none of the adverts i have placed seem to be attracting attention, can someone help me write out an advert.
My tbs qualities are;
Bay
16.3hh
10yr old
He can be ridden by all ages
Does showjumping, could affiliate, not phased by jumps
Does cross country
Currently concentrating on dressage
Good stable manners
Good to shoe, load, clip, bath, catch.
If any more info is needed just tell me.

Can I buy a domain name that is the exact name of someone’s company or trademark?
I want to know if I can buy a domain name that is the name of an existing company but is a domain name that they havn’t claimed yet. If I was to register it (eg; www.microsoft.uk.org) would the company whoes name it is have any legal claim to the domain or would it be legally mine. Also, could I then use it to put adsense adverts on the website, being careful not to use any copyrited logos, emblems or trademarks, names, etc? Can I still write about the company (good things!) and spell out their name (eg, ‘ microsoft’) without fear of being sued, so long as I use a disclaimer to say that the site is not affiliated with that company and all trademarks belong to them, blah, blah? Many thanks! 🙂
I did find some info on the subject, but even this says it is a grey area. Basically, domain registras allow anyone the freedom to buy any domain name, yet there is nothing stopping a company from taking you to court for infringing on their copyright, especially if you are making money from it.
So what do we all think?

I’m currently earning a little money from Google Adsense adverts on my website, and I was wondering if I need to declare this tax-wise. I dunno if these factors affect it:
I’m a university student.
The income wouldn’t break £800 a year.