Been reading through the last few pages of this thread and it appears you absolutely must have miles in your UA account in order to see the 50K/60K offer; is this a fair assumption?

I'm new to this whole miles/points game; I'm coming from an AMEX Business Costco card which was netting me about 3.2% (not bad I thought), but now that I plan on doing more flying in my life.. I could use all the miles/points that I can grab. Currently I have a Chase Sapphire Preferred and my trusty AMEX. I just signed up for a MileagePlus account and logged into united.com, but when I visit the links provided in this thread I only ever see the 40K bonus.

Assuming I do need miles in order to receive the offer, how many miles should I have in my united.com account and would anyone be willing to transfer miles to me (I can pay) to make this happen?