You should always test run your new machine AS SHIPPED before
adding anything, just in case.
Once you are sure everything is working O.K.
You'll be pleasantly surprised how many truly useful applications are already included in your applications folder.
AppleWorks is fine for most text document needs
and you can always copy paste the content to an e-mail.
You can also use Text Edit for simple documents.
Open your System Preferences from the dock. {Square with the Apple
and the switch}
This is your control panel for all your personal tweaks.
Network Settings, Appearance Settings, Mouse and KB settings
and so on.
Once there open your Energy Saver prefs and set your sleep setting to NEVER. You don't want your system to got to sleep while you're installing
any OS software.
Then once you're online, open Software Update and download and install any current OS updates and patches.
EVERY time you install software, you should open your disk utility
and "repair permissions" after you log back on.
Utilities are located in your Applications folder.
Mac Starters Guide has lots of recommendations.
https://forums.macrumors.com/threads/132963/
My essentials basics are mostly available through Versiontracker
Lil Snitch personal firewall.
Adium Instant Messenger client.
Pixel Tester 2.1
Stuffit Delux
BBEdit
File Buddy
Pacifist
Temperature Monitor
Real Player
FireFox
Carbon Copy Cloner
KDX Client
Open Office
iWork
Optional Purchase Items
Microsoft Office
Toast Titanium
PGP Desktop
FileMaker Pro
Adobe Acrobat Pro
MacGames is good for Game reviews.
Oh and you can trash IE completely!
I'm sure others will have some other recommendations, but this is all that comes to mind at the moment.
Enjoy!