Hey el_polo11, welcome

First things first: We can't discuss or even just mention anything about selling or buying alkaloids or dried plant matter here. The only way of aquiring DMT we talk about on this site is extracting our own - which we'll gladly help you with if/when you want to do that.
So, on to your question.
N,N and 5-meo DMT are quite different!
- 5-meo is significantly more potent by weight. 15-20mg is a solid dose of N,N. For 5-meo it's more like 5-10mg.
- 5-meo is significantly more dangerous from a medical perspective. You CANNOT combine it with harmalas or other MAOIs/RIMAs - you'd literally risk death. There's probably other interactions too, research this well if you take any medications or drugs (cannabis and psilocybin shouldn't be a problem) before you consider doing 5-meo. You should absolutely have a sitter at least for your first time with it, because some people have seizures on it (potentially with foaming), and you don't know if you're one of them. I don't want to say that's impossible with N,N but it's much less likely. Typically with N,N people just lay there with closed eyes for the duration of the trip. Anytime a report mentions DMT without specifying which one, it's usually talking about N,N.
- the trip is different. N,N is often colorfully visual, 5-meo is more often described as white light. Of course there's much more going on (with both) than the visual aspects. I never had 5-meo, and i lack the language to talk about the mental and emotional happenings during my changa trips (N,N plus harmalas infused herbs that i smoke).
I think you probably want N,N-DMT at this stage.