I don't know how much fresh resin to use. SWIM only has dried resin he got from Europe. For dried resin, 500-1000 mg orally is the low end dose. When used sublingually about 200-700 mg is the low end dose.
Virola bark is reported to contain:
DMT 0.130%
5-Meo-DMT 0.110%
6-MeO-THC (2-methyl- 6-methoxy-l,2,3,4-tetrahydro ß-carboline) 0.010%
N-Methyltryptamine (MMT) 0.003%
Now those figures are for virola bark with the inner glossy resin still intact. The glossy material in the inner bark is dried resin. Most vendors sell bark that has had all the inner glossy resin removed (you can usually see the scratch marks) by the natives who use it for themselves, which means the bark you buy on-line is pretty much useless. You need to buy dried resin if you want anything worth while.
Virola does contain an MAOI, it’s 6-MeO-THC. It’s probably a RIMA like most oher ß-carbolines. RIMAs are a lot safer than a normal MAOI. Normal MAOIs require special dietary restrictions, RIMAs do not.