Need help with print quality

Recently have assembled a VC4 500, managed to get it printing a model fully, but the quality needs work. The main issues are -stringing, -poor ability to build bridges -and visible layer lines. Printing with PLA with 0,6 nozzle and using Orca slicer. Are these issues solvable through slicer settings or could they be mechanical by nature? Would reallly appreciate advice as this is my first experience with a ratrig. Let me know if other specs/settings would help see the issue. Thanks in advance!