Chances are he has read through the tutorials-.
I suggest beginning by first downloading a browser like "netscape" or "firefox". From there open up 4 tabs.
The first one put in the Marketplace and keep it there.
The second one put in the exchange.
The third one put in the exchange.
and the fourth one put in your pms.
From there look through two threads at once and search for items that are for sale; if you find a donation item that is inexpensive and that you personally find pretty cool then check the price of that item in the marketplace-. (make sure to put lowest buy on so you can find out how low it actually sells for)-. Always remember to take what you find in the marketplace as lowest buy, and then subtract a couple hundred gold from that... (sometimes it wont sell for lowest buy).
If the item has around 1k or more leeway then buy it, otherwise your risking it... Also you have to use your instincts-. Which is why I tell you to see if you like it, generally if you think a donation item looks bad then so do other people 3nodding
Another tip: never buy letters that are like 2 months old unless you want to save them and re-sell later, because they are impossible to sell!
A good way to do that is to simply find donation items you want on your avatar for a while buy them, put them on, and keep them until they rise in price a bit :] (I wouldnt do this until you get a good amount of start up gold so you can buy and resell).
:: Just try doing that and see if it works out for you, and remember... buying from exchange and selling in marketplace is a great way to begin and then as your exchanging becomes more regular and large you can start selling in exchange and maybe even start up a permenant store! ::