What would be and equivalent for area51?
First and foremost, please remember that reputation is not important on Area 51. Yes, you get a couple extra privileges with reputation, but all the important privileges are unlocked by 150 rep.
All you need to get to 150 reputation is to confirm your email address and gain the association bonus (which, by the way, you already have). All you need to do now is confirm your email address.
Other than that, there are a few other ways to gain reputation:
Upvotes on your example questions: 5 reputation
Follows and commits on your proposals: 5 reputation
Referring a user to a proposal: 5 reputation
Fulfilling a commitment: 50 reputation
A user fulfilling their commitment on your proposal: 25 reputation
All privileges you can earn from reputation can be found here.
A person's Rep on Area 51 has no real meaning or value.
The only way to gain rep is by posting good example questions on Proposals.