I have found an oldd dogewallet and checked if there are clams on it.
the receiving addresses are empty but one of my sending addresses got 4 clams on it.
how to get the private key for the sending address?
What is a "sending address"? You can only send coins from addresses that previously received coins, so I would think the "sending address" is the same as the previous "receiving address". Or do you mean that there are some CLAMs on an address you once sent some coins to, but don't control? In that case the CLAMs belong to the owner of that address.
Sorry I can't give you a better answer, but I don't think I really understand the question.
What is the minimum amount of coins, I need For the POS to work someone okay?
What I been doing this lending them out on poloniex, I don't have a lot of coins as of yet will get more soon
Every 16 seconds, the wallet client will hash together a bunch of information for each of your mature unspent outputs in turn and check whether the hash is lower than some target. If so, that output gets to stake. The target is based on the size of the output and the current network difficulty. The smaller the output, the lower the target, and so the lower the chance that the hash will be lower than the target.
Any non-zero valued unspent output has a chance of staking, but the chance is proportional to the value of the output.
A 1000 CLAM output will stake about once per day.
A 1 CLAM output will stake about once per 3 years.
A 0.1 CLAM output will stake about oonce per 30 years.
Etc.
So a single 'clamtoshi' output (0.00000001 CLAMs) can still stake, but it is very unlikely that it ever will. The expected time to stake for a single clamtoshi is around 300 million years.
So I'm telling you there's a chance, yeah!