Your first 24hrs After your Shahadah...
Once a person has said shahadah, certain purifications need to made.
1. A female should trim her nails short, shave the hair under the armpits and pubic hair.
2. A male should trim his nails short, shave the hair under the armpits, pubic hair and the hair off the head. He must also get circumcised as soon as possible.
Narrated by Abu Dawood (356) which says that the Prophet (peace and blessings of Allaah be upon him) commanded a kaafir man who had become Muslim, “Shave off the hair of kufr and get circumcised.” (Classed as hasan by al-Albaani in Saheeh Abi Dawood; see also al-Mughni, 1/276; Sharh al-‘Umdah by Shaykh al-Islam, 1/350)
Hairs under the armpits and pubic hair should not be aloud to grow for longer than 40 days.
After you should take a shower (ghusl) and wear clean pure cloths. By clean it is meant they should be free from impurity such as urine, faeces and dog saliva.
You should learn how to pray and start praying if the time of prayer has arrived. Please look in the worship section of the website on how to pray and for prayer times.
Muslims must eat with their right hand, not eat pork and other haram (forbidden) food.
Muslims must use only their left hand for cleaning themselves after relieving themselves in the toilet. Clean with toilet paper and then wash with water. (istinjaa)
Muslims must also not allow urine faeces or dog saliva to be on their body or clothing.
Muslims must not flirt, date or have sexual relationships with the opposite sex other than their husband/wife.
Please also note that once one says the Shahadah, he or she starts with a blank slate. No matter how bad the person sinned before embracing Islam, he or she is forgiven. So there is no need to worry about past sins. You are sinless and pure. Now you can start to build your new record of deeds.
May Allah make it easy for you, and grant you Paradise. ameen.