Depends on your budget, really. For basic steel, I'd go with Buckingham or Klein. The tree Klien gaffs hook out so they set further out from the tree, so it's a preference thing. Some love them, others hate them. I climbed on Kleins for several years and loved them.
Next step up would be aluminum, Bashlin is pretty much the best choice there.
Next step up would be the Buckingham T2 titaniums. I have these. They are lighter than the aluminum without the bulk. They are the same thin profile as the steel climbers.
Most expensive choice would be the carbon fiber Geckos.
For pads I'd recommend either the velcro wraps or the shin cup pads. Although you're young and would probably be more than happy with even the basic pads for a few years. The high dollar pads are more accommodating for older, less elastic body parts.