There's a lot to start with but to start off with here's some resources you can access for future use.
http://www.reddit.com/r/warframe
https://forums.warframe.com/index.php?/forum/38-players-helping-players/
http://warframe.wikia.com/wiki/Damage_2.0
http://warframe.wikia.com/wiki/Mods_2.0
Play the Intro Quest if you haven't yet.
Basic tips?
-ABC. Always Be Charging. All enemies get an accuracy penalty against you while you are moving, so never stop moving.
-Starting out with, stick with full autos. If you still have your starter platinum, see if you can get all the components for a Boltor Prime and build it.
English
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You can't use your starting plat to trade