Hey, as someone who's played the game since it launched on PS4, it's fascinating reading about the experience of a new player coming aboard. Some hopefully helpful thoughts...
Focusing on completing junctions and opening new planets is your best move right now. The big persistent areas on Earth and Venus are new and shiny, but I wouldn't invest too much time in them right now. They're better to come back to once you have more warframes and stronger gear.
I see someone else already recommended you the Hek shotgun, but another solid weapon available a bit earlier (at MR2) is the Boltor assault rifle. If you're still using the MK-1 Braton, try to get it replaced ASAP. The MK-1 starter weapons are severely gimped in comparison to just about everything else in the game.
Ivara blueprints are gathered from hacking vaults in Spy missions, though the remaining parts only drop on the higher level planets so it may take you some time to get them. Harrow parts drop from corrupted enemies in fissures. Another warframe you might pick up randomly is Oberon, whose parts drops from "Eximus" enemies (more powerful variants enemies that have elemental auras.)
Oh, and if you've got PlayStation Plus, there's a free bonus pack you can download which gives extra platinum, temporary boosters and a few other goodies.
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