Find a gun you like (r201 is great for beginners) stick to attrition playlist. Don't run around rooftops, or run around mindlessly in general (thats like begging to be shot). Dont just focus on enemy pilots, but kill any AI you come across along with helping your team mates take down enemy titans. Try the titan tone out (make sure you have the shield equipped for him) he is a really good starter titan. He is easy to use, does good damage.
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And another few things: once you are better at the game, switch to Ronin. He gives a good challenge, and the Spitfire LMG is also a good starter weapon. Good damage and is very consistent, even at long range.