A good beginner Friendly deck could include Baby Dragon Witch and Valkyrie as main support.
Add Goblin Hut or Tesla as defensive buildings to handle early pushes.
Include cheap cycle cards such as Skeletons and Ice Spirit for rotation and quick defense.
A spell like Zap or Fireball helps deal with swarms and medium HP threats.
Keeping an even elixir cost is important to avoid getting out cycled at this tier.
Practice timing and tower targeting to build consistency before climbing higher arenas.