A few tips, my good fellow:
Be sure to check sites like
IsThereAnyDeal.com or
SteamDB to see what the best deals are. They have pretty good price tracking historical info too, so you can see what you might be able to expect when the sale starts next week.
Unfortunately for you, From has been extremely stingy with their sales since Elden Ring became a household name. But - you never know!
Sometimes even after the sale goes live, Steam still doesn't have the best price. I like to shamelessly plug Augmented Steam as a way to see if something is available elsewhere for cheaper.
Free browser extension that improves browsing and shopping experience for Steam
augmentedsteam.com
Steam's wishlist functionality is good, especially with the above add-on. You'll also get email notifications for stuff you put there now for when the sale goes live.
Unless you're independently wealthy, try to narrow your focus if you can. If you're coming from the world of console gaming, you're likely going to see some crazy prices that you're not used to. Your instincts will say "Even though I have this on PS4, I better re-buy it on Steam, so I can (play it on my Steam Deck | have a PC backup copy | play through this again at some point with crazy good graphics). The Witcher 3 + all DLC will probably be $10, maybe even less. Even though stuff is cheap, it all adds up quick. It's easy to get carried away during your first big sale.
Have fun!