Hey guys! We're going to play Warframe soon so Rowdy wanted me to post a few things to help people on here before hand.
First of all, Warframe is a third person, co-op shooter that's really fast paced. It includes a hefty amount of grinding so if that's not your thing, this game might not be for you. The plus side is that the grind is entertaining and the developers continuously add more areas, alert missions, and gear each patch or so.
One bit of advice I can give would be to find and look up things on the Warframe wiki page located here:
http://warframe.wikia.com/wiki/WARFRAME_Wiki
This includes information about warframes, weapons, enemies, blueprints, etc. It's a very useful resource if you need something specific.
When you first enter the game, you will be sent to the Tutorial before doing anything else. The tutorial consists of the introduction to the Dojo and the AI commander of the Tenno (aka the person in charge of you and all other robot ninja assassins.)
First, she will go through the introduction to the Tenno units and ask you to choose which frame you would like to start with.
IMPORTANT NOTE: THIS IS THE ONLY "FREE" WARFRAME YOU WILL RECEIVE. CHOOSE WISELY BECAUSE IT TAKES AWHILE TO MAKE ANOTHER FRAME.
She will then go over the movement actions, weapon controls, and a bit of target practice. After this she will introduce you to the world screen, the Arsenal, The Foundry and the Marketplace. From there you start at Mercury and the game begins in earnest.
To get new Weapons and Warframes, you need blueprints and resources. Blueprints are rare loot drops either from bosses (on Assassination Missions) or from Alert Missions (Alerts with a "?" reward always give you something special.)
After you acquire a blueprint, you need to collect resources from specific planets in order to make them. Crafting also requires credits and about 12 to 48 hours (depending on the item.)
Warframes however, need a total of 4 blueprints and a certain type of rare resource to put them together called Orokin Cells. In order to make a Warframe, you will need the Frame's Headpiece, Chassis, Systems, and finally The Blueprint to the specific Warframe (which is bought at the market place for 20k - 35k credits).
THIS IS WHY YOU NEED TO PICK A STARTER FRAME THAT YOU LIKE.
As for the rest, just shoot stuff and have fun. If you need any specific details, look on the wiki link. If anyone has anything to add, please post below.
Happy Space Assassinating! :D