@ OP:
Get your testosterone checked at your age. Get a checkup and see if you have any underlying issues prior to working out. Not to E36 M3 in your cheerios, but at your age avoiding injury should be prioritized over working out "hard."
Eat clean, don't drink your calories, avoid white bread as much as possible.
Initially, stick to functional movements that recruit large muscle groups: deadlifts, squats, pull ups, etc.
Drink a lot of water, eat a lot of protein (at least 1g per pound of body weight) and get a lot of sleep.
It's easy to get caught up in the symphony of nutrition advice and the millions of workout plans. What tends to get skipped is the fact that working out does not build muscle; recovering after a workout builds muscle. Adding lean mass requires a LOT of food and a lot of time spent shopping\preparing said food.
Apexcarver wrote:
Watching this as I could really stand to put on 10lbs of muscle. (currently 6'2" and 147 at 29)
Been looking at doing rock climbing to get strength in. (usually I tend towards biking or swimming) What says those more in the know? Is rock climbing a good sub for someone who hates lifting weights?
short answer: no
long answer: I've climbed and taught climbing technique for several years. I could write for a very, very long time on this subject, but I won't.
Especially for a beginner, your deficiencies will be almost entirely related to technique, specifically lack of proper footwork. Most gains you see will be due to increases in footwork precision, climbing schema, forearm endurance, and cardiovascular endurance, in that order.
Progressing to mid range climbing (5.10, 5.11) will necessitate gains in core and upper back strength, though again, increased footwork precision is key. If you're solely reliant on climbing as your workout at this point, imbalances will begin to develop, specifically the "pull" muscles of your back will likely outstrip the "push" muscles. Look at photos of the prototypical rock climber; long, lanky, well defined back, small pecs, almost nonexistent legs.
5.12 is the upper bound of what the average climber can achieve. Beyond that requires genetic gifts, specifically the insertions points of tendons in your forearms.