Yeah I hooked up the USB straight away just incase it needed it and the blue light came on, when it's fully charged the light goes off. Didn't take long at all to charge. For using it 5 clicks to turn it on, hold the button in while you toke after that mate it's just about getting used to it as it is different. Try doing shorter tokes or longer but lighter tokes etc and find your sweet spot mate - I think it's one of those things where it will come down to your own preference. I get a a fair bit of of vapour from each toke so hopefully once you have it fully charged it will fix your issue mate - it's not blow your head off strong for me either though mate but should still kick in quite quickly and stick around for a while :)
Good luck mate, enjoy!