On the nose, dude.
The fact that you want to do it is already more than half the battle. There's tons of videos online that'll help you if you're too timid to go to a class and such. Or if you're really interested in classes I suggest going to your local art store, they always have a series of classes going.
Personally, I never dug the whole class thing, I just kinda went along on my own and progressed over time. It's just like skateboarding, honestly. And as cliché as it may sound, have fun with it or else it'll just feel like homework.
What mediums are you particularly interested in?
On an unrelated note: If any PALS are ever interested in artwork I'm always open for new commissions. Slightly embarrassed putting this out on here but art is a secondary source of income for me and I figured it couldn't hurt. PM me if interested, talk pricings and such. Thanks dudes!