You will begin to learn hexes, jinxes, and curses right away. You have to be an advanced wizard or witch in order to follow along.

First spell -

The Stickfast Hex

In order to perform the Stickfast Hex, point your wand directly at your enemy. Immediately and clearly, shout "Colloshoo!" You must be careful to use this spell, if it malfunctions at backfires, your shoes would be stuck to the ground. This is merely for a distraction and a minute of struggle upon the enemy, as they could easily take off their shoes and continue, and nothing will happen to foes who are barefoot.

The Impediment Jinx/Curse

The Impediment Jinx/Curse can be considered both a curse and jinx. Cast it by a simple clockwise swish with the incantaion "Impedimenta!" This is easy for beginners just like the Stickfast Hex, and is merely for a minute of diversion, but can be used for defense or offense if it is cast powerful enough.

The Blasting Curse

The Blasting Curse causes anything that touches the spell to explode in flames. It can be used as a diversion if cast weakly, but can be used for attack and defense if you shoot it near or at the victim powerfully. If used constantly, the wand may malfunction, but repeated casting can be used to possibly kill the victim.

More advanced versions of Evil Witchcraft are the following:

The Imperius Curse

Used to make the victim do the unquestionable bidding of the caster, and is cast by a simple incantation: "Imperio!" It requires many magical energy, however, so it is recommended for only very experienced and advanced wizards, as a backfire will cause immense negative effects to yourself.

The Cruciatus Curse

A strong spell recommended for forcing someone to do or tell something, this curse is cast by the incantation "Crucio" and a light flick of the wand. It is more difficult to master than the Imperius Curse, and you certainly don't want the curse backfiring or malfunctioning. It is best to use as an alternate of the Killing Curse when you do not want to or are not supposed to kill your victim.

The Killing Curse

The Killing Curse does just what its name tells: it causes instant death to the enemy that the spell hits. Cast by a simple swish of your wand from up to down lightly, you say the incantation "Avada Kedavra" and shoot directly to the opponent. Its backfiring can cause to your death also, so you must practice carefully and certainly away from those Ministry fools.

These spells are essential for an evil Witch.

Male Witches do exist - those who study Witchcraft as a male can be considered a Witch. 

However, not many male Witches exist, as there is a male class of magicians called Warlocks that study Dark Magic.

Evil Witchcraft is a specific form of Black Magic.