I'm new at this, so stick with me.

So I've been reading up on here and two popular options seem to be the Continental 50k miles deal, and the United 50k miles deal. I'd like to sign up for both cards in hopes of having 100k miles after the merger.

What's the best way to do this? Sign up for both at once? Spread them out?

I have mid 700s credit, and 2 chase cards currently.

I'm looking forward to hanging around and learning lots from you guys. Thanks