Hiya
Welcome to DB!!!!
Spearfishing kit is actually quite a bit cheaper than cheaper than your whole scuba kit. Your current scuba gear, wetsuit, mask and fins will do fine. Once you get into it and find out that you enjoy it, which you WILL


, then you can look at long bladed fins and a nice open cell wetsuit.
Other than that, JUST HAVE FUN!!!!
Regards
miles