Advice on rehab budget for ceiling water damage, WDO and mold

[Chris Ready]

Hi all,

Currently working on first deal and still getting to grips with rehab budgets. I have my eye on a 3/2 (1400 sqft) but there's a few issues that need to be rehabbed. I was wondering if anyone had any advice on how much might be wise to budget for the following issues:

There's some water stains on the ceiling that weren't wet. I'm thinking it's likely a roof leak but the roof looks in OK shape. Here are a couple of pics:

There's also some signs of WDO on an outside storage room:

There's also some mold in one of the closets. Does this look like surface or could it be a deeper issue:

Any advice would be greatly appreciated!