#1
bass line cold i play with these chords. just some suggestions on what notes i can play please
these are the chords:

G
B
C Major
F #dim

in that order
thanks
#2
Do you know your scales?
In G :
G - A - B - C - D - E - F# (The E, F# and A more as in a riff, so don`t let that note ring, doesn``t right all the time)
B:

B - C# - D# - E - F# - G# - A# (Same story for C# and G# and A#)

C:

C - D - E - F - G - A - B (This time D, A and B)

F#dim:

F# - A - C - D# (Pretty tricky chord, not so easy to make a bass rif underneath)

And just mess around and find your bass-line...