Guitar stores should have the information on your stock set of strings. It would be best to get this information from them, specifically the gauge and string type, before you buy a replacement set.

Some tips related to guitar strings:

https://www.guitarsite.com/hotlicks/about1016.html – information on changing guitar strings

https://www.guitarsite.com/how-to-string-an-acoustic-guitar/ – although this is for acoustics, the basic principle applies to electric guitars

https://www.guitarsite.com/guitar-string-notes-guitar-string-names-of-guitar-strings/ – some technical information on guitar strings

https://www.guitarsite.com/newsletters/990927/3.shtml – when to change strings