I would recommend to first watch the beginning of darbian's tutorial (https://youtu.be/PInZ2-qfKEU) to understand what "framerules" are and some other basics.

If you want to use a timer delay, it is important to know that the framerules already apply when you load the first level - so starting the timer on the "player select"-screen will not be consistent unless you press start at the exact same frame every time from power on.

People that run this game on console sometimes use the multi-cartridges in combination with a timer delay, so they can start the timer consistent on selecting the SMB1 cart. In this case, i saw that darbian uses a delay of 3.97s to start the game on the third possible framerule. If you want to press start on the first or second framerule, you have to subtract corresponding multiples of ~0.35s per framerule (it's up to you on which framerule you want to start the game).

If you use the standard SMB1 cartridge, you can also start your delayed timer on reset (assuming that the time to reset is always the same). On emulator, the reset times can be different: for BizHawk 1.11.6 (with NESHawk core), i use a delay of 3.75s to start on the second framerule. If you use a different emulator, you might have to record some attempts with the timer running and then check afterwards which delay would make sense.
But either way, the timer should always be at 0s the moment the "400" appears on the ingame timer in the first level (i.e. when you gain control of Mario).

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