if you want to make life really easy, buy some leaded cardas eutectic solder. it skips a stage changing from liquid to solid and helps avoid cold joints (where the solder makes a physical but not an electrical connection.) that said, any 40 percent lead rosin core solder is very easy to work with if you have a high watt iron or soldering station. I had used an iron once before attempting my crack and had 0 issues with cold joints. a YouTube video or two will teach you everything you need.
+1 on the cardas eutectic solder its a quality product and easy to use. One meters worth off of ebay will be plenty for a Crack+Speedball.