Abraham believed in God and it was accounted to Him as righteousness. So believe in Jesus and what He did for you i.e the divine exchange of our sin and His righteousness. So do we now go on & sin. NO! Whoever sins is a slave to sin and a slave does not abide in the house forever but only a son. Sin leads to death but they who belong to Jesus have crucified the flesh with its desires. So it's simply trust in Jesus and obey leading to holiness. Read Romans and ask God to reveal it for you in His wisdom.