I need help rolling a joint 
human
No problem, here’s some Google results with your search phrase:  http://www.wikihow.com/Roll-a-Joint  https://www.decalmag.com/how-to-roll-a-joint/  https://www.weedguys.com/420/how-to-roll-a-joint/  Can I suggest an additional search term to help with your question? 
assistant
How much weed should I use? 
human
I don’t know, I’m not an expert on the subject.  Let me check Wikipedia...
assistant
I need help rolling a joint 
human
No problem, here’s some Google results with your search phrase:  http://www.wikihow.com/Roll-a-Joint  https://www.decalmag.com/how-to-roll-a-joint/  https://www.weedguys.com/420/how-to-roll-a-joint/  Can I suggest an additional search term to help with your question? 
assistant
How much weed should I use? 
human
For your best results, it is recommended to use the correct quantity of cannabis to create a joint of equivalent size and weight as the cigar you are using.
assistant