1) I downloaded the latest wallet version but it gets stuck trying to download the block chain. Dont know what to do.
It can take a fair while to download all the blocks. There are 481,267 blocks as I type this. If you're syncing for the first time you should follow these instructions
here.
2) What is the percentage for POS for 9 day intervals?
You don't get that many coins from staking but it's definitely better than trying to PoW mine. Based upon my most recent stakes it looks like:
Original transaction x 1.0003 = returned amount
So 1 billion coins would generate ~300,000 extra coins when it stakes. You would get 2 new transactions, each of ~500,150,000 when it stakes, these new transactions would then be eligible to stake ~9 days later.
Each time you stake your transaction count doubles, this is why PoS becomes more dominant after a while because it creates ever more transactions which need to stake on each cycle.
3) How do I know if I am on the correct fork? I left my coins on Swisscex because I was scared to download to my wallet in the past because of the many problems that had occured. Thanks again.
You can check your block count either
here or
here or maybe even request some free coins from the
faucet to test your wallet. SwissCEX was fully in sync last I checked.