The DIY forum is a great place for information. It's very hard to know what is "going wrong" as it were, without knowing what recipes and steps you used. I will say that many flavors do require steeping, so if you are getting a "perfume" without flavor, that may just mean your actual flavor may take a week or so to get going... I don't even taste my mixes until 48 hours have passed, as it will be pretty flavorless otherwise, and then I may be tempted to overflavor what's already in there, leading to yuck, later. If you post exactly the steps you followed (including PG/VG percentage, what percentage of what flavors, and how much sweetener) etc., those more experienced may be able to help you out. I have mixed up the odd batch or several that I've hated as sometimes flavors can mute each other, or if out of balance, won't taste good either.... Some flavors you can shake and vape, others not so much.
I'd suggest putting your mix somewhere and shaking it and steeping it for a while, a week at least (you can taste vape it along the way to see how it's coming...) before vaping it. It may or may *not* be delightful, but there are tons of recipes on the DIY forum that are really great, as well as people making their own. Everyone's different though, so you're going to have to develop a sense of what YOUR palate likes, also. I like lighter, less sweet mixes for a variety of reasons, and I've also made some very strange mixes using my own flavors while adding in a bit of store bought flavors to fix it, like my "Appalachia berry mix," that was super strong and sweet out of the gate, but when I mixed in and steeped some store bought coco and brandy, the slight hint of chocolate and the more sour notes of brandy ended up making it taste really great! So, the only rule of thumb I can say is, write down what you did so you'll be able to replicate it if you like it, keep tasting, have some patience, and there are many mixing calculators that are easy to use if you decide you want to follow a particular recipe to make the process easier! The DIY forum will be your friend....
Anna