I need a logo for a new online language business

I need a logo for a new online language business. I'd like it to be clean, modern and appeal to teenagers and parents alike. I need to be able to use/adapt the design easily for use on Facebook, Instagram, website and potentially going forward in print. I'm not tech-savvy so I'm looking for something failsafe that can be adapted really easily for all of these platforms. Attached is my own working design for the Facebook page cover to give an idea of what the business is and the sort of look/colouring I like. Business name is The Language Locker.
I'm based in UK and would like to have something ready to use by mid next week (27 May).
Looking forward to hearing from you. Shân