Welcome to the forums!
In the “Build compendium”, there is a large section with builds for beginners. Most of them come with detailed explanations, advice for leveling and “budget” setups for early endgame. Enjoy!
BTW, most of these builds were created in earlier patches. Some items may be different now. Don’t worry. In fact, most leveling items were rather buffed than nerfed in the latest patch. So all of these builds basically will still work as intended, in some cases even better.
If you got further questions, feel free to ask. 
EDIT: Ooops - Medea is right… Should have asked before. The link I gave is for game with all expansions. But if you like GD, I’d recommend to get them all anyway.