Underwriting spread sheets/ forums

[Brian Hopton]

I am just starting off my real estate journey and currently looking to buy my first investment property.  I am having trouble understanding how to underwrite properties and see if they are a good investment and can be cash flowing.  I am wondering if anyone can help me find a good underwriting spread sheet that can help analyze different properties?  I have also heard of online groups that specifically focus on underwriting, are there any good websites or groups anyone could recommend as well?  

Thank you!!