Yes, please clarify your needs exactly. There are fairly easy ways to do conversions from and to bytes, integers, strings, and chars. The problem is there is a lot of them, so we need to know what you are doing.
- Where does the data originate (Your PC's Serial Monitor, Another PC Application, The Arduino)?
- In what form is that data?
- Where is the data going?
- What form do you want the data in once it is received?