Jl777 calculated 0.38% per annum currently.
There are at least 2 or 3 forging pools now under development - you 'lease' your balance to the pool, the pool forges and you can get the earnings from the pool operator...
This is a bit like pooled mining vs solo mining, pooled forging will give you some return more frequently, solo forging will give you a return much less often...
Always better to pool unless you have a large stake, just like with PoW you only solo mine if you have terra hashes of mining power.
Look on NXTforum - join one of the pools, great thing is you don't even have to be online once you have set the lease, the account you have leased the NXT to forges on a single computer somewhere....
tbh 1000 NXT is not going to get you much..