Well if you are really interested into juicing, I suggest you bring back your juicer to the store, and get a better one.
Pretty much all juicers work with high-speed centrifuge force, which heats up the juice and destroys precious enzymes. They also tend to leave a not-so-dry pulp, and are a mess to clean up.
After spending 15 hours on the subject, I decided to go with the Omega 8003 model. Payed 450$ Canadian for it. Best buy ever.
Low-RPM with mastication, 3 min to clean up, can juice Spinachs, WheatGrass, pretty much anything... Extremely dry pulp, too.
As for recipes, try to have a solid base of leafy greens, carrots are good, and then something sweet (fruits) to give a nice taste.
Here is an example
Spinachs + Celery + Parsley
Carrots
Lemon + Orange + Grapefruit.
Apples don't always juice well, some of them produce a lot of foam, depends on the brand.
With my juicer, making a juice with 6-8 ingredients takes about 12 min, cleaning included. It's living fuel like you've never seen before. 15 min after taking it I can feel my head working better, more positive thoughts and concentration.
Juices with 2 ingredients are good, 6+ is better for your health.
Don't take too much carrots either, as they contain a lot of Vitamin A (liver) and can give your skin an orange glow if abused.
I suggest you look into the book The Juicing Bible, which contains recipes and the effects of each and every fruit and Vegetable on your body, which you will then be able to adapt depending on your goals / condition.
Also, it is VERY important to do it with Organic veggies, else you will get a nice concentrated dose of pesticides and chemicals. Vegetables are affected differently by their organic / non-organic culture. Spices, such as parsley, aren't too bad because they don't need that much pesticides to keep bugs off. Others like Carrots, are the most OGMed, transgenic, chemical stuff you can find.
I once bought those normal, 99c a bag carrots for my juices. 30 min after drinking it I had a headache and felt down and aggresive. Repeated the experience 2 times, same result. Went back to organic, no more. Friends with juicer have confirmed the phenomenon. When you extract everything from veggies, quality and toxins ARE an important aspect.
Have fun