Since it's a higher end resort, tickets can be pricey. Luckily, this resort is part of the Epic Pass if you have one. Although the pass is pretty expensive itself, you can pay if off relatively quickly with a few ski days/trips. If you don't have the pass, Breck is worth paying a little extra. Especially if you want more options and higher difficulty runs.
The mountain is kind of separated into sections of difficulty. Often times a specific chairs will have mostly black or blue runs. There are also some chairs with mainly green with some blue. The important thing is to know where on the mountain you want to be, because I sometimes find it difficult and time consuming to make my way across the mountain. This is because a lot of the lifts take you close to the bottom of the mountain, and in order to get to a new area you have to go all the way to bottom and then back up another chair.
Since getting across the mountain can take more time, I like to focus on one half of the mountain before lunch, and another part after lunch if I want to mix it up. Some of my favorite chairs for blue/black runs are Rocky Mountain SuperChair and Colorado SuperChair. Both are right next to each other at the bottom of Peak 8. These lifts give you easy access to the bowls or E-Chair, which offers lots of blacks and double black diamonds.
On the other side of the mountain, Beaver Run SuperChair, C-Chair, and Mercury SuperChair offer great runs starting from Peak 9. These have a lot of blue and black runs, as well as some greens towards the bottom. A-Chair or Mercury are probably the best for beginners, since a lot of greens are in this area. C-Chair meets up with some of E-Chair's runs, so there are also tougher ones in this area.
It's definitely worth it to trek across the mountain, even if it takes some time. Both sides have great runs and a lot of variety. Plus, it's so pretty!