Sorry for late reply, not many use the forums outside of the crafting section it seems. Toss me a /tell Daemonhall or /tell Daemonhell in-game if you need help. I'm fairly new myself about a week in.
Here is a couple fishing guides, both have similarity so find which one works best for you. I just started fishing also, I'm using the composite rod and sabiki rig setup.
Also if you're level 7 you probably want to wait to fish until your hit about lvl 20 so you can get to the Valkrum Dunes town Selbina reliably, thats where you start fishing.
viewtopic.php?f=20&t=2785viewtopic.php?f=20&t=13300There is two separate guides, both have very useful tips at the beginning. I suggest giving those a quick read.