Here are some tips for the fusions:
Blue-Eyes Ultimate Dragon: 3 Blue eyes white dragons at level 2
Summoned Lord Exodia: R. & L. arms, R & L legs and exodia the forbidden one all at level 2
Gate Guardian: Sanga,Suijin, and Kazejin at level3
Metal Zoa: Zoa level 2 & steel scorpion level 3
Rabid Horseman: Battle Ox & Mystic Horseman at level 3
Millennium Golem: Destroyer Golem & The Statue of Easter Island at level 5
Kaminari Attack: Ocubeam & Mega Thundeball at level 5
Cyber Saurus: Blast Juggler level 5 & Two-Headed King Rex Lv.4
Twin-Headed Thunder Dragon: 2 Thunder dragons at level 4
Thousand Dragon: Time Wizard level 3 & Baby Dragon level 5
Harpie Lady Sisters: 3 Harpie Ladies level 3
Metal Dragon: Lesser Dragon level3 & Steel Orge Grotto #1 level3
Flying Penguin: Penguin Soldier & Penguin Knight level 2
Darkfire Dragon: Firegrass & Petit Dragon level 3
Flame Swordsman: Flame Manipulator & Maskai the Legendary Swordsman at level 4
Kwagar Hercules: Hercules Beetle & Kuwagata ALpha level 3