ok, let me help.
first, join mantidforum.com.
now, you caught some nice looking Mantis religosa nymphs. To tell the sexes apart, count the segments. <7=female, >7=male. The are nymphs, meaning the are not mature and cannot be mated. Yet. Once they mature (by shedding their old skin for a new one, and thus increasing their size), if you are lucky enough toget a pair, they can be maited. They are mature when they have wings. NO SOONER.
For now, focus on keeping them healthy. They require nice ventilation (no stuffy stagnant containers), a shady spot/indoors under a light to avoid overheating, and prey items. Keep them under 70% humidity, but no lower than 30% to aid in shedding. Shedding is the most vulnerable time in a mantids life, and a bad one can result in death or injury. M. religosa takes about any bug 1/2 its size or smaller. it is a notorious under-achiever, often getting scared at things smaller mantids could take no problem. Also, they are nototirous for dying without cause. So, if they do dye, it may not be entirely your fault.
Hope this helps!