I need Facebook/LinkedIn cover photos, logos small and large, Twitter designs, etc

My name is Amber and I'm a social media intern. They have asked me to revamp their media, which is fine, but I just need some help on the design front! We’re a start-up based in London dedicated to making moving abroad easier and we officially launch next week.

I will need:
- Logos for LinkedIn, Pinterest, Instagram, Facebook and Twitter
- Background and Cover photo designs for Facebook, Twitter and LinkedIn

It is for a travel company, Trip Advisor style esque. I have a screencap of what the website will eventually look like, so the designs must be in coordination with the design of the new site. The logo has been created, but it needs to be made to look square to fit in on social media. Maybe circle bordered like a bubble with matching colour to the house in the logo.