A teen trying to bulk up

Hey r/Fitness I'm a 15 (almost 16) year old trying to bulk up. I'm a male who is about 6 feet in height and 155 or so pounds. When I was younger I was a fat kid and starting 7th grade I did cardio every summer to burn off those calories. Now I am much thinner (I used to be 5"9' and 170-180 or so) and I want to put on good weight. I have some useful things to help but I was hoping the people here can help guide me on what to do since I realize teen fitness is far different. I'm not looking to body build, I'm just looking to put on enough muscle to be respectable (after all being 6 feet and not have any muscle is a sin).

My parents keep fit so we have an array of work out DVDs including: Slim in 6 and Tony Horton's 10 minute work out (the rest of the DVDs in my parents' experiences as adults didn't show much results)

We have an exercise bicycle downstairs along with a home gym (Power tower, butterfly machine, leg press machine, this one row type machine, pulldown machine, along with something to simulate a bench press, and this one back thing that is very similar to the Good-morning exercise). I apologize if anything I described wasn't too clear.

We also eat whole grain/wheat, have meat at least once daily, and I make sure to cut out empty calories. I have a multivitamin from GNC meant for training and some protein shake powder.

tl;dr: Teen trying to gain muscle but I'm in no rush. I have some home gym machines and an exercise bike.

Thanks for any help you guys can give and feel free to ask questions if I wasn't clear on anything. (I'm typing this in a hurry)

EDIT: I am aware there is a search function but incase anyone has anything original for my situation I figured I'd check. Additionally situations are different. I'm not sure I can afford some great gym, I am in different situations.