@Mirzaba if you have a lot of hair to remove at once, it might be worth looking into waxing? i've not tried it tho!
for picking a shape, there's a bunch of guides on proportion online. i used this one http://www.paulaschoice.com/expert-advice/makeup-tips/eyes/makeup-tips-tricks-eyebrow-shaping-tweezing-tips.html (which apparently just refreshes if you don't have cookies now...) they are just guides tho, ignore em if they're not helpful

for technique, lisa eldridge's videos get recommended a lot, because they genuinely are fantastic. http://www.lisaeldridge.com/video/