الجواب وبالله التوفيق
First of all, you should make firm and resolute intention to stop engaging in such heinous acts and continue on doing tawba and astaghfar.
1- It is correct to place the tissue as you have mentioned however you should wash the private part before performing wudhu.
2- You should pray salah with utmost dedication and concentrate on the actions you are performing.
واللہ اعلم بالصوا
