Help Calculating Repair Costs and ARV!

[Jake Valencis]

Hey everyone!

I am getting into real estate investing this year. I am currently in the process of purchasing my first investment property with my sister in the first quarter of this year. While I am going through the process and waiting for some things to get completed. I'd like to get into wholesaling to make extra money to invest in my deal. 

I have been looking on YouTube, the Biggerpockets Forums learning how to calculate repair costs and ARV. This is an area where I'm struggling. I believe I will be able to comprehend better if someone is running numbers on a property I'm looking at, in my area so I get a better understanding.

Below is a property in my area (622 Currant ct, La Plata, MD) that is listed for $290,000. It has no pictures of the interior, just the exterior. It has roof damage on the corner where it looks like the roof is rotting. 

What are your thoughts? 

Thank you all!

(I know it's not a good idea to post the property address because someone might take it. I'd rather just gain the knowledge)