Hi all,My name is karim im new here,i just bought an electric guitar a Yamaha EGR 121 C it comes in a Gigmaker Pack with 15 watt amp ,tuner bla bla bla,i just wanted to know if my guitar is good or not and also i wanna know how do i do slipknot tuning the C# G# E B F# B thing i have only in my tuner eadgbe but theres bass tuning in the tuner too so wat do i do and the letters have numbres beside it like B 5 e1 something i dont really remember so PLZ CAN ANYONE BE TOO KIND TO HELP ME