Great news, congratulations, and welcome to Feverbee Experts, it's great to hear from you.
What's driving this fairly tight timescale?
I'm also a Salesforce user and thankfully, depending on the extent of customization you might need, building your community isn't that difficult, I guess it depends on what features you want to utilise, what elements of your Salesforce org you want to expose etc. the Salesforce Community was a godsend for me over the last 6-8 months for technical advice and tips. Feel free to ping me with any questions (caveat: I'm by no means a technical guru but know my way around a bit now!).
Good luck with everything, lean on this group as hard as much as you need, there's a TON of knowledge, experience and information in and around!
Be sure to let us know how you're getting on!