Client has offered me work via Upwork email. Do I wait for an official contract?

[milesmuso]

Hi,
I'm new to Upwork and I think I have my first confirmed project, but I'm not sure of how to proceed.

A registered Upwork client has sent me an email asking if I'm happy to accept one piece of work from him, with more to follow. Of course I answered 'yes', but I'm not sure if this constitutes a binding official offer/acceptance contract. This is potentially my first Upwork job, so I'm not sure of what I should do next. Do I wait for notification from Upwork? Should I advise the client that he needs to click a button somewhere to officially start the process?

Here's the email I received (with names deleted)....
________________________________________________________________________________

**Edited for Community Guidelines**

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The client seems to have used Upwork before (his profile history lists 15 to 20 proposals, 4 interviews. 1 job posted, $35 total spent, 1 open job.1 hire) so I'm sure he's not trying to bend the rules, but I really need to know how to proceed from here.

Thanks in advance for your help

[milesmuso]

Result! The client has just sent a confirmed offer via Upwork, so I'm sure everything is kosher. So I won't need any more help on this thread. If you've read my original post: thanks! 

[robin_hyman]

Hey Miles,

I just want to confirm it is ok to communicate off Upwork.  Just make sure all payment is done through the platform.  As a newbie please read all of the available resources or come back to the community and ask away! 

Good luck!

[milesmuso]

Thanks for the advice. You guys are SO much better than Freelancer!