Hi, I'm 18 and my height is 180cm and 61.8kg and I'm very skinny with high metabolism rate(Eat a lot but don't gain much weight..and it seems like the fat all goes to my tummy >_<) and my friends call me "the fat among the skinny" =.=||
So recently I've joined a gym and during my 1st workout with free session with a PT of course, he call me do lots of stuffs and by the end of the day, my whole body achingespecially my shoulder part. But he say if I want to gain weight should concentrate on weight training and resistance, howver...from that workout..my whole body ache...

My question is, should I wait until recover and continue workout? and most probably after each time workout[i guess] my body will ache...so the resting time/recovering time kinda long let say a week? before i can go for the next workout..so i think kinda waste of time....so should i be like u all erm let say monday weight training for legs and body part? then wed arms part?as in seperate the weight training into different day? and should i do on cardio exercise as well like treadmill? and also is it drink soy milk would be ok for me too? bcoz i got allergic to cow milk...each time i drink my whole throat will stuck with phelgm which cause me to be very very uncomfortable...