Hey PokeBeachers, I was thinking of getting into PTCG, but am not sure if I should wait XY out as it will get discontinued from expanded because a new series will release or should I go for it?!
Welcome aboard and... take a breath. Seems like some of your facts are in error, making this sound more difficult a decision than it probably should be for you.
The Pokémon TCG has
two Constructed Formats it uses for sanctioned events: Standard and Expanded. "Constructed" is when you bring your own deck to an event. This is different from "Limited" where you build a deck at the event with cards provided (like at a Pre-Release). The
current Standard includes all XY releases save
Lysandre's Trump Card (it was banned), while Expanded is all BW
and XY release except
Shiftry (NXD) and
Lysandre's Trump Card (again, banned). Pokémon rarely bans cards; the last time Standard had a banned card before these two was I think 2002, so don't let that worry you.
Also don't let set rotation worry you. It is something you need to understand and plan for but its not as severe as you think it is. This September, Standard switches to
XY: Primal Clash and later releases.
Expanded does not change. Now it might change eventually, but for now it has been confirmed it will remain all BW and XY cards except the two banned. If you aren't familiar with it, the main tournament series that ends with the World Championships uses
both Standard and Expanded at different tournaments. Places like Pokémon League usually let you play what you want, though finding an opponent can be difficult it everyone favors a particular format. Also remember that all of this is just for sanctioned play; when you're with your friends you can use whatever you want!
It is easiest to ease into the game. Try some Pre-Releases. Maybe build a budget deck and try League. If you do want to get serious and try competitive play, then start getting cards and learning the game now, and you should have time to become decent before the first tournament series after the World Championships.