Hello caapinoob,
Welcome to the Nexus. You have come to the right place to find your answers. There is so much information here which will answer all your questions if you can put in the time to read it all!
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The place to start is the WIKI (link is at top of the page...I know, it should be more prominent), especially the FAQ section of it.
Also, for the questions you asked, the 'pharmahuasca' and 'ayahuasca' subsections of this forum will have old threads which will deal with those very subjects. And the extraction sections of the forum/WIKI will help you towards success in your future extractions.
Good luck - there certainly is a lot to absorb, but it is important to be as knowledgable as possible about these life-changing plants.