Breezesong: After Breezesong goes to fireclan, click the arrow that goes to fireclan. then she will tell you she got accepted into fireclan and stuff. if you chose to meet up in secret then every night you can go to the fireclan border and talk with her. eventually she will bring up the subject of you and ryeheart being related. then you can do a gravestone quest . (Talk to littlebird first or some other fireclan cats) when you put herbs in your inventory (Like plumbago) and click the grave that have thought bubles but no fherbs on them (TALK TO LITTLEBIRD FIRST). After or before that, talk to Hawkclaw and he will give you a quest asking to know about dustfeather. talk to amberclaw first, then dustfeather.
(Sorry if this is a lot)
Heatherkit: when heatherkit said "fire will come" she meant that if you don't defeat firestar before the rains come, brambleclan will leave the camp forever. you can't find them and you'l just be stuck in an empty camp foreverr.
(I hope this helped. :3)