All the different options can be a bit overwhelming I know I want to focus mostly on the bigger ships, though from the game I was able to watch the main complaint the rebel player seemed to have was that tie swarm can decimate so I know i want an answer to that.

Are there any websites that can give a overview of what each ship would be best at and some standard builds?
I know I want the new ships that are coming out for rebels and maybe a nebulon b or two, I tend not to build strict tourny lists

You can check out my commander's guides - general overview of each ship. I've got some tactics in there as well.

Concentrate Fire is another good resource - definitely check them out.

If you're more of a youtube sort of learner, Let's Talk Tactics is a good option as well.