What you look at is up to you.
Start with things like meditation, grounding and centering, breath work, directing and raising energy, etc. to give yourself a solid foundation within Magick before moving onto things like spells, otherwise you may be disappointed when you produce little to no results lol.
Those spells were either made by people who don't know what they are doing, or by those who are purposely looking to cause trouble.
Google is your friend, use it.
What you should look into greatly depends on how much knowledge of the topic you already have.
If you are just starting out then looking into some basic practices such as: meditation, visualisation, centering, grounding and energy manipulation can be a real help for building a foundation of knowledge.
However if you have already looked into the basics then findind a path that you are interested may be your first step, look into something that you are interested in and find some forum posts, books and other sources of information that may help.
If you're serious about learning how to do magic and with starting from the rock-bottom then you don't start out by casting spells, you start out by learning how and why magic works.
You see, there is no such thing as an "easy" spell or a "beginner" spell. One either understands how magic works and has mastered the basics...in which case the magic will work..or you haven't done that sort of work..and no spell will work no matter how "easy" it seems.
Casting a successful spell involves much more than finding some spell on the internet or in a book, saying some words, lighting a candle, waving a wand of any of that sort of thing. In order for magic to work you need to understand how and why it works in the first place. Grounding and centering, visualization, focus and intent, energy manipulation, etc are all necessary first steps to even begin to have a chance at a spell actually working...and more importantly to prevent a spell from back-firing on you.
So, my advice for anyone who is truly serious is to start by reading a few books and practicing the exercises those books will give you. Once you have mastered the basics you won't need anyone to give you spells, you'll be able to create your own spells that will be far more effective than anything you find on the net. Here's the books I suggest:
"Before You Cast a Spell" by Carl McColman
"Spells and How They Work" by Janet and Stewart Farrar
"The Veil's Edge" by Willow Polson
"Modern Magick" by Donald Michael Kraig
And the following links in this thread will also help you learn the basic skills necessary for effective spellwork.
