Affiliate Marketing Secrets

Okay, so I have the concept of advertising on twitter, which was the simple part, but how do you go about getting a decent user name?
Let’s say I was advertising for Nike, I wouldn’t just have a twitter account that said @nikerunning… That already exists… So how should I go about changing the name to something that works, selling what I’m selling, and not copying Nike?
(By the way, I’m not advertising Nike, just an example).
Anything helps!

Air jordan retro 4 £130
http://m.jdsports.co.uk/mt/www.jdsports.co.uk/product/jordan-iv-retro/31089/?cm_mmc=froogle-_-product_feed-_-affiliate-_-froogleprod&aid=600
Nike air Max 1 premium 2013 £96
http://www.footlocker.eu/gb/en/Nike-Air-Max-1-Premium-42.aspx/4206966104

Air jordan retro 4 £130
http://m.jdsports.co.uk/mt/www.jdsports.co.uk/product/jordan-iv-retro/31089/?cm_mmc=froogle-_-product_feed-_-affiliate-_-froogleprod&aid=600
Nike air Max 1 premium 2013 £96
http://www.footlocker.eu/gb/en/Nike-Air-Max-1-Premium-42.aspx/4206966104

Can my domain name contain another companys trademarked name? For example, if I were to purchase a domain name like, www.buyusednikesneakers.com and sold used nike sneakers on there would it be legal? It’s the same idea as ebay just with a more specified niche and specified domain name.

I want to create a product but its affiliated with a company. Example but not my product idea: Say i want to make a pair of Nike sneakers but since NIKE already made sneakers id have to use there company logo for this product. So how do i start up my product and pitch my idea. I feel my product can deff sell in the market but im 25 years old with only $1000 to my name.

Has anyone ever brought from this site?If so ,what was your experience?
http://www.shoebacca.com/nike/jordan-spizike-317321-103.html?afref=google&utm_medium=affiliate&utm_campaign=GAN&utm_source=k232270
Also do you like these shoes