Your English is definitely good enough to travel around in America.
Telluride is difficult to get to when compared to many typical tourist spots in America, because it is far from major airports. Your best bet is probably to fly in to Denver, then hitch a ride with someone in to Telluride from there [1].
As far as what to wear, bring enough clothes for all seasons. It can feel like it's 100 degrees in the sun, then snow at night. It snowed this year Sunday night / Monday morning after festival. Bring sunscreen for your skin and lips. Bring sunglasses and a hat.
For gear, bring a warm sleeping bag and a sleeping mat. Bring $20 in quarters for the showers.
[1]
http://www.festivarian.com/index.php/board,9.0.html