I'm assuming you want to redo Alttp game (ie Snes game) so that it looks and plays as Zelda1 (for Nes).
If you truly want to edit Alttp in any way (even into Zelda1) then go here:http://www.zeldix.net/
You should also know, that people will not do things for you. There are rare ASM Alttp masters and they have already done some impossible achievements. It is higly unlikely and very complicated to "make" new items, which are not in the game.
There is also to be noted that a lot of effort with making any Zelda game goes into dungeon creation and general debugging. If you can not do these things yourself, you can not expect, that others will.
You have 1 post on Romhacking. The general idea is this: the so called Supervisor (in this case you) should do most of the work for his project and it is thus expected to know a lot. It is a paradox, that someone who is not in charge would know more, than the one in charge of the project.
For instance I could remake Alttp into Zelda1 mimic or Link's Awakening mimic, but only Overworld and dungeon wise. The new items and events are really not happening! (way to much Asm). And what would be a result of this: the game that we all know already.
We are thus more busy with making actual Alttp hacks, with overworlds and dungeons, which players never seen before, and using Asm to create those new items which the engine would allow without bugs.
I can only suggest to you, to try to make a so called Master Quest of Alttp, to first see, how this is edited. A true Zelda1 on Alttp rom is highly unlikely to be achieved (spoken by me, who knows Alttp inside out). You can however create a very decent mimic of the game:
For instance: there are 9 dungeons in Zelda1. But 1,+3+1,+7+1 in Alttp. You can not tell the Alttp engine to suddenly have 9. Not to mention what this would do to menu which has 3 pendants, 7 crystals default... and the hardcode to 7+3 rooms to drop main items; or in other words 9 crystals can never drop, to then have the "out-tro" sequence of a solved dungeon.
So I would say, you have much better chances of making the Zelda1-Alttp hybrid. For instance: Asm to skip to the crystal collecting was done by Euclid. The 7 crystals dungeons can then match/be redone to the 1-7 from Zelda1. 1 dungeon could be additional (main item but no boss or crystal). Level-9 of Zelda1 would then be build on top of Alttp-Ganon dungeon.