Frankly, I'm assuming that you have been choosen by a coach (High School/ College) to be a wide reciever, so this means that you have natural ability.
1. God bless you
2. You either have natural speed, hands, agility, or a combination of
3. No weight trainging will help you in either one (maybe speed, this is up to debate)
My best recommendation, would be work on sprinting exercises for cardio
warm-up: Knee highes 3 sets 40 yard, ass-kickers 3 sets 40 yards
All out: sprints- 40 yards hard, until you toss-em or close
Routs/footwork find your QB, hope he's as dedicated as you, run routs till it automatic
Hands: (and I assume this is you key goal) There is a pro-potential camp that has prospects look at a light board and hit the light with their had as it lights up. Most people are not previe to that kind of training, so, the best way to learn is catch a lot of balls. I'm a basketball kid, and I can tell you dribbling or playing with a tennins ball helped alot. Try it, carry one all the time, squeeze it to help forarm/ hand strenght, dribbble it to help hand/eye cordination
This may not have been what your looking for, but it will help. Anyone with more (e.i. college/pro/semi-pro) advice obviously trumps mine.
good luck bro,
cookmic5
P.S. basic muscle devolpment will go a long way as far as line separation goes, look at the guys getting drafted now-a-days, they are all 6 foot + 200 + so they can fight off bump coverage