Picking Gear | Warframe Starter Guide
DISCLAIMER: Volt and Mag were reworked right after this video was recorded and edited. For a new player, Excalibur is still the best choice, however I'm not certain whether or not he outperforms Mag and Volt with their new reworks. Volt now has an actually powerful ultimate ability and Mag has a major change to one of her abilities, making it more useful than it was before.
TL;DR: Excalibur still best for new players. Simple disclaimer.
A video that guides you through picking the gear and the reasoning behind picking your first warframe, primary, secondary and melee weapon.
My Twatter: http://tinyurl.com/VladTweets