I've never been big on soccer but this World Cup has piqued my interest; I have followed the Red Bulls very casually throughout the years but I'd love to check out some of the European leagues -- EPL, Serie A, La Liga, etc. If I understand the scheduling right I believe their seasons start in August?
In terms of foreign leagues the English Premier League is the easiest to follow. It's from August to April and the bulk of the games are on Saturday and Sunday (a few Monday and midweek games mixed in) and they start anywhere from 7:30/8:30 AM and go until roughly 2:30 PM. NBC broadcasts the games on NBCSN and their main channel. For the games not on those they carry them on their app and overflow channels (for some providers). They also have a Match of the Day show which shows highlights from every game that day. It's excellent.
Fox Sports has the rights to the Bundesliga which they will start broadcasting in 2015-16. The USMNT has a fair amount of German-Americans that should still be playing in Germany in 2015 (Julian Green, John Brooks, Timothy Chandler, Fabian Johnson, Terrence Boyd).
Liga MX (Mexico) has a lot of broadcast on US television. I just started following it this past year but ESPN has a few games and those Spanish channels (Univision?) carry a lot of the games on the weekend. There seasons is split into 2, it's kind of weird but it runs on the European schedule.