Definitely forget about candyflipping until you actually feel it's 'necessary' to make either of them more interesting. Separate they are wonderful and if you just take it easy and take the time to appreciate them they can be mindblowing. Trust me, it would be very impatient and greedy to start with that right away... whatever interesting you may have heard about it or however cool it may sound.
Also it's so much more unpredictable combining powerful things like acid and mdma increasing the chances of finding it difficult to handle. A safe environment is always a good condition, but it honestly doesn't automatically make just anything a good plan.
There's plenty of reasons, including that you should always know from your own experience how potent your batches of the drugs are before you can even begin to consider what proper doses would be. It's not safe to just assume you have the drugs just as they were advertised by the dealer. There are quite a few things out there including drugs like 25I (fake acid) that would not be safe to combine, and should even be tried carefully by themselves unless you want to be responsible for bad things happening.
Don't think it's particularly smart to try ensuring a positive LSD trip by adding the MDMA or something like that either... I have experience with it, and while yeah for sometime in the future when you are experienced, it's an option to consider, it's kind of ridiculous to expect that it wouldn't be mindblowing enough to just have nice decent LSD trips first, or rolls.
Considering it after trying them separately is the very least you should do, and assuming you have good quality stuff, proper reactions and full blown experiences with both to actually refer to.. you should get a better idea of why they are plenty interesting to explore separately first.
Issue can be though that I don't believe most people would have a decent picture of something like LSD before they do it a whole bunch of times, not one try. So even trying it once by itself - while perhaps it may already say a lot, will still leave a lot to say.
sorry about the tone of voice but come on, the hybris.. ;p
If you prefer not to believe a guy like me for it, be honest about the matter and perform a search in this forum about something like 'candyflipping first time' and read a shitload of comments, because you are not at all the first one to ask this.. and I guarantee you almost everyone will tell you not to go at it like this.
It's not like you actually lose anything by postponing this a good while, you can always come back to it and do it later. It would be such a shame to make it complicated and difficult and ruin your 'relationship' with drugs like these right from the start (or worse).
Or you know, stop combining so many drugs before you learn how to use them safely on their own? (yes that other thread)