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There is a bit of info in the wiki here. I suppose it could be expanded upon.

So what form of DMT do you have?

Some people drop like 200mg harmaline in a glass of orange juice with 50mg dmt and drink that either together or separately.
You can also use harmine, or syrian rue extract, or caapi extract. If it is freebase, the citric acid in the orange juice converts it to make it easier to be digested. Or a shot of lemon.

If you have harmala hcl and dmt fumarate then you probably don't even need any kind of acid at all and you can just mix them into water and drink. Start low so you don't take too much at first. work your way up every time until you find your sweet spot.

Here's the way I do it. Definitely not the most nausea-free method by a long shot, but I find it to be effective and reliable nonetheless. I take 4g syrian rue and crush it up (with a spice mill) and stuff the crushed up rue into gel caps (the bigger the better, try to get "00" so you don't have to swallow as many). Then I'll poke a few holes in the gel caps. Sewing pins or thumb tacs come in handy for this. Then you can dissolve DMT (I would start with around 50mg, but you may find it weak, and thus work your way up slowly in the future) in orange juice. I like to take the gel caps of syrian rue first, wait 15 min and then drink the DMT-OJ. Normally I tell people to smoke a little more DMT (only like 10mg) especially if they're not feeling much and it really kicks things to the next level, but if you really don't wanna smoke, and you notice effects but they're not as strong as you like, I suppose you could try taking some more DMT in OJ, but I'd really recommend just 1-2 hits of 10mg if you're up to it. It's really something else, and my favorite parts of life have happened after vaping 10mg on a pharma session - pure bliss and beauty.

I personally don't mind the purge (too much), but if you're going for nausea-free, then you'd wanna extract the harmalas from the syrian rue or caapi and convert the freebase DMT to DMT-fumarate using either FASI or FASA which I believe are in the wiki as well. Freebase DMT will make you nauseous as will syrian rue or caapi. For me purging is part of the experience.

thx

On MHRB extraction, start here: DMT Nexus FAQ

You will find that there are many options, one of which will fit your circumstances well. Feel free to ask more specific extraction questions in the relevant sub-forums in the DMT Extraction section.

Thanks.

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Yep. Essentially any tek that gives you DMT can be used for pharmahuasca.