The seeds you sow, hoping to earn paradise is offering Salat, giving alms, reciting the Quran, treating your family and friends well and respecting people of other religions as well. Our Prophet Mohammed (PBUH) has also led us by this example.
On the day of the judgement, people who sow these seeds will get the fruits of their hard work. The fruit will be the great blessing of paradise. Hence we should hope that we will get the fruits of the work we are doing today. Those who are successful in this will work will be able to be with Prophet Mohammed (PBUH) and his companions in Jannath Al Firdhaus.
Offering the 5 obligatory prayers daily is the most important act all Muslims should engage in if they want to attain paradise. Other acts of worship such as giving alms will also elevate your level.
Any act of worship will bring you close to Allah and hence everyone should work hard to increase acts of worship.
Taken from a lecture given by Sheikh Ibrahim Menk