It all depends on your business model and what you expect in return.  

Excess acreage, usually over 5 acres or what is common for homes in the area will be discounted or ignored as to value with Fannie/Freddie, VA, and FHA mortgages, USDA can take more land value, depends on the region, but my guess would be 20 acres.

Depending on your market, your broker splits, and your investment price points, you might be able to just game plan one deal a month, and go full time sooner than you think.  

So say you are calling a list of leads you have received (I'm going to begin calling next week so I'm open to any advice); but say I called down a list....As I go, depending on responses I receive, what do I do with the leafs?

The option really depends on your plans and situation as everyone's situation may be different.

A good power wash and coat of paint on the outside goes a long way too.You can get estimates from many mobile home-specific contractors that understand these needs if you are not going to do it yourself.Basic repairs on a decent old home can run between $2,500 to $15,000 depending on how bad of shape it's in.

Some people build it for cheap, it all depends on how you manage a project.

I know it depends, but dang.

All depends on the addendum of contract the bank gives you.

Depending on the property 5-15% is reasonable.