transistor gain and loudspeaker

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i'm trying power small loudspeaker (8ohm 0.5w) off attiny output using transistor , have hand these , these. i'm trying calculate base-pin resistor value i'm struggling ascertain gain either of these transistors: specs mention "minimum dc current gain" display value in volts - thought gain should simple ratio... missing here?

also, right in thinking "maximum dc collector current" max current transistor allow through device i'm powering?



lastly, remember reading 1 should wary of voltage spikes when coil devices discharge , diode can protect against this. should worried enough introduce 1 here?

thanks.

quote
the specs mention "minimum dc current gain" display value in volts - thought gain should simple ratio

the gain simple ratio, specified particular collector-emitter voltage (vce) , particular collector current (ic) - higher current, lower gain.


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