umm a good first time dose is say 30 mgs... as you become comfy dose higher. some peopel have harder and softer heads for dmt, and that doesnt necesarily correlate w/ their hard heads for other psychedelics. i have a high tolerance to everything, but can get remarkably far on suprisingly little dmt, that being said ive done very high doses of it w/ great satisfaction. id opt out of a lightbulb, and freebasing in general, unless you know how to vape freebases (ie you have smoked meth out of a bulb or methpipe) meaning its sorta tricky... easiest way yet can be somewhat wasteful is on a bed of herb (pot, parsley,mint,etc..)