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Sometimes to help clean the iron tip i usually use a wire brush or wire toothbrush thingy, you need a little amount of solder on the tip before applying it to the job, try not to make a ball of solder rather coat the tip in fresh solder to help heat transfer to the job, if you then apply solder to the part of the tip that touches the job you'll see it flow, once it flows remove the iron.
I guess theres many ways to solder but me using soldering irons almost every working day for the past 10 years you get used to watching how solder flows. Temperature is important, if its too low you get the joint too hot because you leave it on there too long, you need to find a good temp where the solder will react instantly, i'd practice on a few bits of scrap pieces you have around to get used to the process.....
Cheers!
PS...resin cored solder is best, you have to have very good clean joints!
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