Mid tear PC build for that let fully try SD

I understand that my old laptop is not enough for SD, till now I work online, but it's not so nice, I want local, so looking build PC.

Budget around +-1500 with the monitor and other parts. I was thinking about : i5-13400, rtx 3060, 1tb ssd, if need add HDD, 32 gb ddr4 ram.

But maybe some one can help me with my choices.

Is i5-13400 enough? a lot of people tell me that better i7 or i9, but I don't think is worth that +few hundreds extra

Can I after if need to add a second GPU like 4060Ti, can i run SD smoothly with 2 different GPU?

I don't have a lot of understanding about motherboards, I found info that most of popular cheaper motherboards don't support ddr4 ram and 13th gen CPU?

Any help or advice would be really nice. Want to build PC for learning and trying more things, and don't want to invest too much, because everything changes so fast