Logo: a graphic mark or emblem commonly used by commercial enterprises, organizations and even individuals to aid and promote instant public recognition, need to be simple but able to stand out in a crowd
Business Card: typically includes: logo, company name, employee name, title, phone number, fax number, email address, company address, and web address, typical margin is .25" to .125"
Inspiration
I like the way orange color and simple circle that is obviously a tangerine but isn't overdone. The orange and red give it a vibrant edge.
I like the way the A is in the circle and is made up of flowing lines.
I like the way the branch interacts with the with the As and it looks like it was just blown by the breeze. It is a very calm logo.
Research
Letterhead: a printed piece of paper used to send letters, memos, etc. Typically includes: logo, company name, company address, phones number, fax number, and web address
Envelope: the packaging that contains the letter/form when being mailed, standard #10 envelope. Typically includes: logo, company name, company address
Inspiration

I like the way the design is all on one side and leaves the page very open.

These pieces have unity with the recurring logo and gentle wave at the bottom.