You realistically need at least 2.000G by 5pm Spring 2 (Fiberglass Rod + Training Rod + 35 Bait).
Roughly estimated, this is how you get there:
-500G (starting income)
-100G (Introductions + gifting Willy)
-~300G from selling Fiber (1G each; there's enough weeds on your farm/in the forest to get there, plus the scythe doesn't use energy)
-~100G from selling Sap (2G each; you'll chop quite some trees for Foraging 1 and wood anyway and each tree gives 10G worth of Sap)
-~400-500G from forage (day 1 forage (including food from trash cans) + day 2 beach)
-~500-600G from selling fish/getting Bait from treasure chests (~8-9 hours worth of fishing)
You should also sell any Clay (20G each) you get day 1 as well as turn in most artifacts you find (250G; there's some outliers like Elvish Jewelry that are technically better to sell if obtained day 1); both of these help a lot but are not reliable (unless you use exploits or the Predictor). Selling Coal (15G each) or Geodes (50G each) gotten from rocks is debatable; the latter is always worth it if you already found an artifact, the former might be necessary to spiral out of control even though you need to buy tons of coal later.
Another possibility is crafting Spring seeds and selling these to Pierre if you found at least 1 of each forageable; this nets an extra 170G over selling them raw (assuming no quality) but takes detours both on day 2 as well as later (you'll need to find those forageables again).
Finally, there's the option to not plant the 15 parsnip seeds day 1 and sell them instead; that's an extra 150G early but means missing out on early farming 1 as well as food for the day 5 mines.
Missing the Rod day 2 basically equates to half as many fish for about half a day of fishing; you'll also probably miss getting Fishing 4 on day 2, which is fairly crucial (Fishing 4 generally means a bump in fish quality due to the additional cast distance, plus it makes catching Catfish much more consistent). Trout Soup can mitigate fishing 4 to an extent, but compounds the loss of money from only having half the fish; and less money early tends to worsen over time in min/max runs.