This is the Crashcourse for Dummies
Now Step 1. You need a GPU(Graphic Card) 
Step 2. You need a AMD GPU or / Nvidia (they have lower hashrate cuz processors)
Step 3. Join a Miningpool like 50BTC 
Step 4. Download a Mining client
Step 5. Enter your Mining Information of your pool and start mining
Step 6. Wait and chill
Step 7. Expand your rig