1. Level 7 is where you have stated. You get there via a minidungeon which is shaped kind of like a 2-legged table (it goes up, turns right, then goes down again). This dungeon entrance is in one of the cliff faces in the desert, I believe one screen west of the Level 7 entrance; it comes out one screen east of Level 7 (which you may have noticed you cannot get to directly).
2. The 9 screens in the NW corner are Death Mountain. Did you try anything at the dead-end that looks like nothing at all happens? There is a trick to accessing it. However, without the Triforce, it's not going to matter yet. Anyway short answer: you cannot walk there DIRECTLY, you have to take... tunnels 😊
3. The first wallet is in the Second Overworld. In the SW corner of the First Overworld, you have to solve that huge 7x8 cave, then when you emerge, go two screens right, push a block by the Digdoggers (big guys you blow the whistle), then use the 3-way warp to open up passages in the First Overworld. If you come out of a waterfall doing this, DON'T TAKE THE DOCK or you will have to do it all over again; go back in to the waterfall instead. Once you have the Second Overworld open the Small Wallet is in the west graveyard, the Large one is one screen east of King's Tomb (a secret path) and the Wand is in the Proving Grounds (also on a secret path, after you solve the Lost Lake).
4. L2 boomerang is under the Lanmola room in Level 5. Use the whistle.
5. How about I mention: there is no Hookshot, Hammer, Boots, Gold Ring, Gold Arrow, Cross, or Flippers. (there might be a fire boomerang, not sure).
Anyway since you have 19 hearts you have found the 2nd overworld, so go THERE to find that western graveyard and all that. Once you finish L6/L7, you play in the Second Overworld til you find the Wand, then you can open L8.
Item locations:
Wooden sword - start cave; shop (1st overworld)
White sword - graveyard minidungeon southwest of lake around Level 1 (1st overworld)
Magic Sword - secret minidungeon in northern graveyard (1st overworld)
Master Sword - a secret screen, Three Eye Rock (1st overworld)
Wooden Arrow - Level 1 (1st overworld)
Blue Candle - Level 2 (1st overworld)
Power Bracelet - Level 3 (1st overworld)
Whistle - Level 4 (1st overworld)
Raft - Level 5 (1st overworld)
Bow - Level 5 (1st overworld)
Ladder - Level 6 (1st overworld)
Red Candle - Level 7 (1st overworld)
Letter - very small "T" shaped minidungeon in forest (1st overworld)
Magic Key - Level 8 (1st overworld)
Silver Arrow - Level 9
Red Ring - Level 9
Blue Ring - northern graveyard minidungeon (1st overworld)
Wooden Boomerang - start cave, or sold in shops (1st overworld)
Magic Boomerang - Level 5 (1st overworld), or sold in shop (2nd overworld)
Magic Book -- uhhh, I forgot, it's somewhere though!! 😊
Superbombs - shops in Death Mountain and in Level 9 (1st overworld)
Lens of Truth - Level 9
Mirror Shield - northern graveyard minidungeon (1st overworld), overworld caves (2nd overworld)
Bait - overworld shops; there's also one in a level somewhere (1st overworld)
Heart Containers:
3 to start
+1 per level, at boss (x8)
+1 in north minidungeon, northwest screen (1st overworld)
+1 by using raft southwest Level 1 (1st overworld)
+1 by power bracelet at dead end (eastern 1st overworld)
+1 under push-tombstone in graveyard by minidungeon to White Sword
+1 in northern waterfall at dead-end with dock (1st overworld)
+1 in various 2nd overworld locations (2nd overworld), as follows:
- blow whistle at dead end of fast blue Lanmolas;
- blow whistle in Lost Hills at small, circle-y dead end;
- blow whistle on southeast screen of 2nd overworld to make a dock appear;
- blow whistle on southeast shore of Lost Lake by Zols;
- push block by red Lanmolas, south of Stalfos 2's;
- burn tree by Moldorms with Traps;
- bomb cave in upper area in southeast corner of western graveyard;
- burn tree at west shore of long horizontal multiscreen rafting
That should get you going...