Blah,
Seriously been surfing for 4 days! Yeah starting out on a shortboard is tough, wanted to do the longboard, but wanted to save a few bucks and craiglist my board.
Seemed like my efforts were futile, but guess what>? Stood up for the first time ever today! Yeah was up for long, but I stood up.
So here are some tips form my personal experience, PLEASE feel free to correct me in any way since I'm still a noob working my way to be a pro.

(Obviously the tips are not going to really help if you just read them, you have to get in the water and practice one thing at a time)
1.) Paddle- You really have to be in the sweet spot, so your not wasting all your energy. Find your center of balance, your shoulders arched, your nose should be about 3 inches off the water. Not to far forward, not to far back*. When you paddle, use your arms next to your board taking nice long strokes. Follow through. Use your board as a guide. Then when your on the verge of catching a wave, paddle like mad! So far paddling has been the most important thing for me. Needs a lot more improvement.
2.) Duck Dive- Why waste energy? You can figure out how to do it yourself

(google)
3.) Reading the waves- I feel like your really have to be in the right spot, the breaking point. Still learning a lot about this. But form my experience watch other surfers catch waves, it helps a lot.
4.) Practice pop up- Practice the pop up on the beach, I know you might look like a noob. O well you have to start somewhere.
Where I am at... I can stand up, but I'm not learning forward enough. Going to practice tomorrow some more. From Southern Cali, pm me if your near Redondo.