You will find a split of people on here that believe in secondary and those that don't. I only rack to secondary when I'm dry hopping or adding fruit or something similar. In my opinion it has become unnecessary. I think the original intent of racking to secondary was to get the wort off of the yeast cake as soon as fermentation is complete to avoid off-flavors. But with today's yeast strains, it doesn't seem to be a problem. I prefer to leave mine in primary for at least 2 weeks before doing anything to it. Then I'll rack it if I am doing something else to it. If you do want to use a secondary, siphon it just as you would into the bottling bucket, leaving as much trub and gunk behind as possible. BUT, make sure that your beer has completely fermented before racking. If not you will wind up with an unfinished beer that will probably be too sweet. Take a gravity reading with a hydrometer and make sure that it remains stable for 2-3 days. Then you'll know fermentation is complete and you can rack to secondary if you want to.
Good luck with the first brew!