Istihadha is of three types, little, medium and excessive. Little istihadha has no ghusl. You only have to clean the area and change your clothes if they became najis and wudhu is required before every namaz (if between two namaz no blood came out, then no need for wudhu). Medium istihadha has one ghusl per day along with following the rules for little istihadha. As for excessive istihadha, one must perform one ghusl for fajr, one for zuhr and asr (and pray both without delay) and one for maghrib and Isha and the ghusl suffices in place of wudhu.

Regardless of which type of istihadha you're in, you must pray and fast however there are additional rules.

1) Perform ghusl hayz. For example let's say you started with istihadha during which you will follow the rules of istihadha and pray and do all the wajibat. Once the bleeding becomes hayz, you will follow the rules of hayz and not pray or fast. At the end of hayz, ghusl hayz is required.

2) Hayz is minimum 3 days and maximum 10 days. If the bleeding extends 10 days, then on the 10th day do ghusl hayz and after that, it will be istihadha and as you said you have little istihadha, there will be no ghusl required after. You will have to do wudhu before namaz and purify the area and change undergarments in case they became najis with istihadha blood.