They have the new player/returning player exp they don’t wanna do wild right away they’re better off doing the return player and get tons of free packs.
I would say stick to standard honestly, Wild is complete Degen to return and play - with 4.5k gold you can buy some packs til you get 1 legendary from each expac you haven’t.
After that See what card from the pack you open til the 1 legendary and then see what is your optional build for meta deck if you wanna craft a deck.
Also you should got the returning player and should get a free deck after doing all that stuff.
you can look at those deck and see what you perf and etc.
If you haven’t claim a deck get the Libram Pally deck as that’s mid-range, so is GA , if not there is some control or combo deck depending on the class.
It really Depends on what you have as options.
But def buy packs 1 at time til the legendary of standard you might get lucky and get them in a few packs and have tons of gold to spare after to buy the mini set or might spend most of it and be down to few gold after.
Just remember there tons of resources you can look into and see what flows your boat, also try out the Battleground, Duels and etc as free player to see if you like those modes also.
Welcome back and don’t get stress out, Standard will be more focus on balance and etc, while wild will be pure Degen and feel like you can’t do anything if you try to climb higher in ranks.