How about reading this: Fashion & Style Glossary By FashionBeans
and this: Men’s Fashion Basics – Part 93 – What Tailoring A Suit Can Do For You | FashionBeans
and maybe all of these: Men's Fashion Basics - Fashion Advice For Beginners By FashionBeans
Clothes from eBay are fine if they're in good condition.
I'd especially read the articles on capsule wardrobes and the ones like "5 items every man should own". This will help you build your wardrobe.