How to calculate offer on first home?

[Carlos Tapia]

Hello, my name is Carlos I am a registered nurse in California. I am looking to buy my first home/ investment property in the midwest where I am originally from and close to my family. I have found a home that I believe I can fix up and in a great location. I am looking to make an offer. However, how do I go about figuring out how much to offer? 

thank you in advanced, 

Carlos, RN :)