When you are searching for weedlines, are they visible(out of the water), or are you looking for something specific on your graph? Probably a silly question but i'd like to know for sure if i'm going about this the right way.

Both.  If I see soemthing on the depth finder and I am not sure whether it's grass or some other sort of structure, I will send a C-Rig down to see what it is.

alot of weedlines are visible from the surface. if not you can usually find them on the depthfinder.

Depends on what type of lake your on....In Minnesota where I vacation you have alot of Deep Weed edges...They can be deep as 20-25 feet pending on water clarity...These areas become very important when looking for concentrations of Bigger Bass in the summer...It's hard to pinpoint the best spots on the deeper edges, but if you keep at it you'll find small spots that can hold several big fish or a massive school of smaller fish....

many depthfinders show the bottom "density" in different color greygraph.  solid black at the bottom of your screen means hard bottom as opposed to weedbeds which may show up as spotty grey.

When you locate the weedbeds what lures do you throw?

weedless  ;D

t-rigged worms and lizards on the edge of it. topwater lures and weightless plastic worms over the top of it.

Wow thanks for the tips. That helps a lot. I really needed to know what it looked like on the graph, thanks LBH for making that clear.

Shallow submerged weeds that are 2-3 feet under the water and have a defined edge can be a great place to throw a spinner bait over them and burn it to the edge then let it die and fall in front of them....Strikes come on the fall of the spinner and can be explosive....Same can be done with a Jig N Pig, swim it over and let it fall in the weeds then jerk it out and let it fall off the edge....

Surface weeds have alot options....Fluke, Rat, Worms, Horny Toad,  and if the fish won't blow the surface I use a Heavy Jig N Pig and punch through it to see if they are on the bottom.....Same with a heavy weighted worm...Or salt craw...

Deep weed edges are awesome...Once I find the sweet spots I'll throw a 1/2 ounce Jig N Zoom chunk and let it sink into the weeds and pop it a few times and let it fall off in deeper water....Limits can be caught this way....