1) The first line says that your graphics card is mining at 23 khash/second, the second line says you have found a valid share, so far you have found 55 valid shares out of a possible 55 so 100% of the shares you have found have been good
2) When you are logged into your pool you need to look at the dashboard - it will show you there how many coins you have mined - you will get some coins when your pool finds a block - you have a very low hashrate so will not find many by yourself
3) On your Xencoin wallet click the receive tab - create a new address (bottom left) and give it a name like 'Xencoin Hasher' if you're mining on that pool (so that you know where the coins have come from) - copy and paste the address into the payment address section on the 'my account - edit account' section of the pool.
If you want to test your wallet create a payment address, call it 'Donations' and post the address on here and i'll send you some free Xencoin to get you started

You never know some of the other Xencoin miners might take pity on your low hashrate and send you some too!!!
4) You'll earn a percentage of the block found based on the percentage of shares you submitted to the finding of that block by the pool as a whole - so basically yes.
5) Not sure of the answer to this one - i do know that you should avoid mining on a laptop for long periods though as it will not be able to cope with the overheating.
Ok tnx so much now it is clearer for me but...more new thing I know more new doubts come to me.
Into the
Statistics ---> Blocks of my pool I can see a table like this:
I have another doubt related regarding how to know if I am earning some coin.
Block Validity Finder Time Difficulty Amount Expected Shares PPLNS Shares Actual Shares Percentage
664630 Confirmed crackers 21/03 07:53:49 0.18 200.00 11,552 996 559 4.84
664586 Confirmed crackers 21/03 03:41:13 0.18 200.00 11,552 1,017 2,307 19.97
664217 Confirmed crackers 20/03 09:54:41 0.18 200.00 11,552 791 1,435 12.42
So it seems to me that in the lasts hours some blocks was discovered but I can't see no XenCoin in my dashboard, why? :-(
What represents the value in the previous table?
I am interesting to know the meaning of the "Finder" field (crackers...what is...a user or what?", amount, expected shares, ppns shares, acrutal shares and percentage...I can't find info about the meaning of these fields