#1
Is there any fun bass lines to play to show off between songs or sets?
-PV14 Mixer
-Crown XTI 1000 Amp
-Two PR15 mains
-Shure SM58
-Dbx compressor/gate
#3
depends on your ability... also what sort of gigs are you playing to who?

i find just throwing in a few improve slap bits while a guitarist retunes/a singer warms up the audience never goes down badly. Maybe just play a quick couple of bars of the chicken or if you want to show off portrait of tracy. Pro tip: well known = more appreciated...
#5
Learn to counterpoint and improvise in the fills (spaces between a lead instruments phrasing). When you do this with a lead instrument, jazz crowds go nuts.
        ,
        |\
[U]        | |                     [/U]
[U]        |/     .-.              [/U]
[U]       /|_     `-’       |      [/U]
[U]      //| \      |       |      [/U]
[U]     | \|_ |     |     .-|      [/U]
      *-|-*    (_)     `-’
        |
        L.