First thing you'll want to keep in mind is that when joining the none beginner lobbies, is that a bit more will be expected of you, this has only really surfaced with the beginner lobbies, anyways onto the important bit.
That is you will more likely have a lot more losses then in the beginner lobbies, this is to be expected and shouldn't discourage you, trust me, we've all had our fair share of losses, look at what happened during the match see if there is anything you can do better, if you have any questions about builds, ship choices, tools, or anything in particular don't hesitate to send a question my way via PM or post a thread about in the appropriate section of the forum for the community to answer, however I would also recommend looking through the guides that have been written and see if there is anything you can learn there.