Using MS Excel as your first Project plan.

You can use MS Excel to quickly timeline out your project without using MS Project.   Another PM shared how he projected out his project timeline and it has really helped me in the past to quickly put a timeline together.  The bonus it is quickly shared in email to your team as well.

Let me point out a couple of items here.   I manually put in the first two dates above.  Then I select those two cells and drag to the right to auto-populate the rest of the dates.   Then I insert my tasks.  Sometimes, I will create a line for each group.  So line one might be network, line 2 server team, line 3 security, etc.   To show what is done by each time.  More of a swim lane approach.   I find this extremely helpful in presenting to the kick off team.  Because this is really fluid and they can tell you  what might work and what might not work based on your projections. For example: there might be change freezes during a period that you didn't know about.  A task that you thought might take 2 weeks might take 3 weeks, etc.   Best of luck to you.