I was really hoping that I could disagree with bikz and ykol, but I think they're right. Your yard is ju-u-ust about big enough for a GWS Tiger Moth, maybe. But you'd have to turn constantly which is difficult and not all that much fun.

I believe that a mini IFO would fly there okay, but they're actually more of an indoor flyer, and don't take wind all that well.

In any case, even starting with a small, 3 channel, electric, foam Park Flyer, will cost you $250 to $300.

The only other viable option would be an Aerobird or Fighterbird which run in the $90 to $160 range and are fairly complete (radio, battery pack, charger).

I personally don't like these last options because they come with 27 mHZ radio gear, and it can not be used in other planes later. Many of them also only offer two channels, and you really need a bare minimum of 3 channels to experience what RC flying is about.
(These will also require at least a large soccer field size area to fly.)

Best I can do for you based on your input.

You can also try EZone. Strictly electric flyers there, and many threads on park flyer type stuff.

http://www.ezonemag.com/

Good Luck, and I hope you find the money and time to really get involved.

By the way, if you can find a local club, and an instructor, you can often find a used trainer and radio gear. That and some basic field equipment (starter, fuel, glow igniter, 12 Volt battery) would end up costing in the area of $250 to $300.
Dennis-