You can eat them fresh, fresh is actually the best way. The drying process will reduce the potency of the mushrooms (especially using high amounts of heat, psilocin and psilocybin die off at low temperatures).

Assuming the 10:1 fresh to dry ratio, you should each consume around 20 grams fresh to feel an effect. Ask the owner of the store for a suggestion though, not all shrooms are hte same.

Give yourself at least 8 hours, shrooms don't go away that quickly.

Again, don't boil the shrooms. The heat (as low as 100 fahrenheit can destroy shrooms) will reduce the potency. Do not bake them into pizzas and such, just eat them with some simple carbohydrates like crackers with some peanut butter.