Thank you!I know a lot of people that will clip the Snark onto the bridge and tune that way. Otherwise, any pedal tuner will work just fine.
An EQ pedal of some sort is almost a requirement when using an upright in a group, to help control the feedback that you're going to be dealing with (depending on the volume level of the group).
Thank you!Snark tuner can be clipped to the bridge; but personally, I'd prefer a pedal tuner, so you can mute the signal while tuning.
Upright bass doesn't need any effects. Some pickups come with preamps that have EQ. If you're using an amp, that will have EQ. If you're going directly into the mixing board/PA, and your pickup system doesn't already have a preamp, you might consider getting a (bass-specific) preamp pedal.