maybe try making some tempura is really easy to do, shrimp, crab, salmon, anything can get fried really in any type of oil,, or make tempura flakes the crunch is nice on top
unagi is fresh water eel its tasty u can find at any local oriental food store
also eel sauce/siracha are great, spicy mayo is good too (mix mayo tobasco siracha kimchi)
mix spicy mayo with crab to make dynamite put scoops on top of rolls, pretty bomb
also for your rice (use sushi rice and ALWAYS wash it in a strainer a few times to get starch off before u cook) make sure after u cook u are adding a little mirin to it (mix some salt and sugar into the mirin)