1. You can't pulsewave your own figs unless there are at least two targets withing PW range, right?

2. First turn immunity & pulsewave. Can I attack mith "multi target" pulse wave during first turn because it does not actually target figs?

3. Can you use more than 32 figs in a team? I assume no.

Nope, that's not true. You can let a PW rip whenever there is at least one target in range, even if it's you own fig. PW doesn't make any kind of distinction between opposing and friendly figs.

Nope. PW is still an attack so first turn immunity still applies.

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3. Can you use more than 32 figs in a team? I assume no.

This is a debateable point that doesn't really have a clear answer. This would be a good question to ask your local judge if you're planning on running a team with more than 32 figs in an event.

Actually you don't even need one target in range. You can PW with no targets in range, although there isn't any reason to.

Although officially Brother_Magneto has indicated that teams can't expand beyond the starting area.

(They gave a starting area for a reason.)