how to make a covered call for options trading?

hotshottrader said: "Hi guys, I am new to trading options, i have been to a 3 hour seminar and learned a bit. I currently trading online in a virtual demo. Has anyone got any experience with covered calls. I learnt about this at the seminar, and it is being done both in the USA and UK. On the Nasdaq, NYSE, FTSE 100 & 250. I would like to practice this options stradegy on the virtual trading demo that i use. So any help very much appreciated Many thanks"