How to go down the line on a longboard?

Hey everyone, I'm back on the forum! I just want to thank everyone, especially jaffa for answering so thoroughly.
Well, I'm having a bit of trouble going down the line. I can paddle out now! And, I can catch a green wave, and I am really comfortable with the drop, even in steep waves. Also, I've been following people's advice on increasing the wave height every time. I now actually feel comfortable in 5 foot waves, which when I started thought were crazy. Sadly, I was riding a crappy cheap foam board, that busted and is waterlogged, and I'm looking at getting a fiberglass longboard, and get into some nosed riding, and then keep stepping down in size to eggs, and finally shortboards! But that's off topic.
I can turn really well on my old foam board, however, every time I'm on a wave, I turn once I reach the bottom, and I can't get higher in the wave, (which what I think you need to do to get speed, right?) Then, because of my lack of speed the whitewater breaks in front of me, and I'm screwed.
Also, another thing I've been pondering that could be related to this is my position when I catch the wave. I'm experimenting going farther out, and it worked for one wave! However, I am kinda scared of this tactic, because I am not yet a very strong paddler, (although I'm getting better) and so most waves where I have to paddle a ton I often paddle as hard as I can, miss, get pounded, and have to paddle back out!
Any help? Haha jaffa, please read this, you're amazing!
Well, I'm having a bit of trouble going down the line. I can paddle out now! And, I can catch a green wave, and I am really comfortable with the drop, even in steep waves. Also, I've been following people's advice on increasing the wave height every time. I now actually feel comfortable in 5 foot waves, which when I started thought were crazy. Sadly, I was riding a crappy cheap foam board, that busted and is waterlogged, and I'm looking at getting a fiberglass longboard, and get into some nosed riding, and then keep stepping down in size to eggs, and finally shortboards! But that's off topic.
I can turn really well on my old foam board, however, every time I'm on a wave, I turn once I reach the bottom, and I can't get higher in the wave, (which what I think you need to do to get speed, right?) Then, because of my lack of speed the whitewater breaks in front of me, and I'm screwed.
Also, another thing I've been pondering that could be related to this is my position when I catch the wave. I'm experimenting going farther out, and it worked for one wave! However, I am kinda scared of this tactic, because I am not yet a very strong paddler, (although I'm getting better) and so most waves where I have to paddle a ton I often paddle as hard as I can, miss, get pounded, and have to paddle back out!
Any help? Haha jaffa, please read this, you're amazing!