That's asked sooo many times on HN. Here are a few threads to get you thinking:
How much equity should i ask for:
https://news.ycombinator.com/item?id=9516991
First employee, how much to ask for:https://news.ycombinator.com/item?id=18052992
How much equity to ask for:
https://news.ycombinator.com/item?id=11130492
How much equity is a good advisor worth:
https://news.ycombinator.com/item?id=1912588
How much equity do you give employees:https://news.ycombinator.com/item?id=565045
How much equity should i ask for: https://news.ycombinator.com/item?id=2635050
How much equity should i give my new-cofounderhttps://news.ycombinator.com/item?id=8668290
How much equity to offer first employee employee:https://news.ycombinator.com/item?id=598509
How much equity should I ask for?https://news.ycombinator.com/item?id=3904759
That should do the trick. Happy hunting