A few things, get a single 8gb stick then add another to go dual channel, and an ATX mobo won’t support onboard graphics so use the old card for now. Definitely get an SSD, with a 480gb for just over £40 or 240gb for £25 it would be crazy not to. As far as CPU it’s hard to see past AMD Ryzen right now, in terms of bang for buck they’re killing it.