Need some tips for starters because I just started playing the game and I dont really understand the ranking system
For new players, you will go through the New Player Ranks, which number from 40-1.
You will receive card packs along the way.
Upon climbing past Rank 1, you reach Bronze 10, the bottom of the main ranking system, and get to choose a deck in the class of your choice.
Now the main ranking system is divided into 5 Leagues: Bronze, Silver, Gold, Platinum, Diamond. Each League has 10 ranks with 3 stars each.
There is more details here which goes into bonus stars/winstreak, and rewards
https://playhearthstone.com/en-us/news/23357896/ashes-of-outland-17-0-patch-notes-march-26?