For a first time dose, (assuming you got quality shrooms) i would recommend 1,5 g pulverized mixed with orange juice on an empty stomach,
that fatass stem in the second bag looks so motherfuckin tasty. i wana eat the fuck out of it and that cap in the other bag and you can have the rest. but yea take 2 grams or if you think you can handle it an 1/8 (3.5). i wouldnt do more than an eigth your first time but anything less than that you should be good. i think its a waste to do less than 2 grams honestly.