FLYER & BUSINESS CARD DESIGN (BOTH SIDES ON EACH)

Information for the business: student marketplace app
Industry: Business
Design details: I have a new app launching and need some flyers for advertisement. I also need business cards designed. I have a logo already to work from. It is a student marketplace and need to show what can be bought/sold on it.
students will select their university when creating an account. I would like instructions to be placed on reverse of flyer on how to download etc.

I will be ordering the business cards for curved edges. I am looking for a sleek design, clear but attractive.

The main colours are blue and grey.

Deadline will be a week if possible?
Target audience: Students
Content on the front/back side and body: Title, logo, website and items that can be bought/sold
Ideas for the visual style: items that can be bought/ sold.
Preferred colors: blue/ grey
Extra notes: I am looking for a professional designer who can supply me with several design examples before I accept the final design. The business card will have less on it than the flyer, understandably.

thanks