I've just mixed my first stuff today.
I got a starter kit from uk flavours
which I highly recommend, I think it's the most value for money kit around as I did a lot of research.
By the way mixing is easy too I've mixed my first sample up this afternoon and I'm vaping it now and I also have to say it's amazing tasting stuff. 50/50 6mg raspberry on its own . The best Rasberry I've ever tried.
I've found the fruit based stuff to be good to go straight away after a good shaking.
Anything else just gets better the longer you leave it, not to say it's un-vapeable straightaway , just it gets better. This whole steeping (wrong term anyway) is just over exaggerated imo.