Rewards and APR: Determining suitable rewards emissions and APR can be a difficult task as APR is a function of rewards, token price and liquidity in the pool, however below are key points to consider when calculating rewards:
1) Target TVL: How much liquidity do you want in the pool and what level of price impact is acceptable? You can compare with existing pools to get an idea.
2) Price of reward token: The reward token price has a direct effect on APR % for the farm. You may want to estimate a price range over the farming period to estimate APR.
3) APR calculation: APR is equal to the $value of rewards for a period divided by the $value of liquidity in the pool, then annualized.
Example for APR based on daily rewards: ($500 rewards per day/$100,000 in liquidity)*365 days = 183% APR
Referencing existing farms can give an idea about the level of rewards and APR needed to achieve a target TVL, however, every project is different and results will vary.
Keep in mind any change to liquidity in the pool or price of reward tokens will affect APR.