They made this super easy to boost. You still have to search for random Kasual matches, you can not create a lobby or do private matches for this. That being said once you match up with your boosting partner you can rematch an infinite amount of times so you do not have to keep searching.
The best way to find each other is to search at the same time. Doing this late at night is better because less people are playing. Me and my friend attempted this around 1am. we searched at the same time and found each other on the first try.
Your mileage may very, but once you get matched up together it's smooth sailing from there.