I think the conventional wisdom is if you're beginning the hobby, start with an entry-level body and the standard kit lens, like the 18-50 or 18-55.
If you go secondhand from reputable sellers, you'll get the financial advantage of them copping the depreciation - they're no longer new. That means if it turns out photography is not for you, your price to on-sell is not radically different from what you got them for.
If you've got deeper pockets and know you're going to be enthusiastic about and good at photography, the advice would be different.