welcome to The Dark City!
DE arent has harsh a learning curve like many people say they are anymore, as the new codex gave them alot of flexibility. The difference is in the mindset. You cant just go forward without a plan like with other armies. You need to always have a set goal in mind, and work towards that goal every turn of the game. Whether its as complex as forcing the opponent into one table corner for table corner objectives at a tournament, or as simple as trying to table them. Every action must push you towards that goal.
That being said, any mistakes made trying to succeed at that goal could end up making you lose. Our army isnt forgiving as power armor armies, and every move must be dileberate. Itll take awhile to get, but the basic concepts are really easy to learn, hard to master.
As for army builds, your best bet is to start out with a starter box or two, transports for each squad (a raider does come in the starter box, but your need one more per box) and some ravagers. After that you can start moving your army towards the faction you like playing the most. There are a ton of advice and army lists out there and in this forum, but a good starter one is
HereIf you have any more questions, post them here or on their appropiate thread, and it will be surely answered
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Status:
Usurping Kabal leadership for his Patriarch
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First 2k GSC List