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I use 60/40 multicore solder 1.22mm, you will only need to set your iron for about 185 deg. I cannot remember the make though as I got from work when I worked in electronics.
you probably wont need a flux pen as multicore solder has flux built into it. I would recommend buying a disordering pump and some disordering braid though. I also use tip tinner to keep my soldering iron tip clean.