It needs roof, ac, electrical, possibly plumbing, new bathroom, new kitchen, flooring repair, siding and fascia repair, and on top of that there is some fire damage.

I like when the tenant puts a check in the electrical panel box and landlord picks it up on the first.

For example, a house built in 1920 with new HVAC, new roof, and a new electrical panel might be a better buy than a house built in 1950 with original systems.For the gardener services, why have a line item for it if you are handling it?

That could be one contractor depending on what is needed or several for different specialties like electric, plumbing, drywall, and so on.

Run  some 220V wiring in pvc underground (licensed electrician) to power a good pump if you have space/amperage reserve in your electrical panel. 220V requires less current to run than a 120V for the same power, so it's more efficient.This guy has a lot of good videos on diy yard drainage systems.

I am interested in what happened after that… I just saw a very nice-looking house with all the heating and electrical and plumbing torn out, and am tempted to bid… I would LOVE to find a construction partner in Detroit with a proven record of rehabilitating these lovely old homes, and save them.

By "partial" I mean renovating the kitchen and bathroom, painting the place, re-tiling the floor and maybe adding some smaller features that can make a difference to prospective buyers, such as new A/C units, new internal doors, or maybe even sell the place furnished (home staging is not really an option here); with no or minimal demolition, and hopefully without electricity or plumbing issues.

I want to build more confidence in bigger projects: flooring, tile, electricity, etc.

I can see having to be licensed to do electrical, plumbing, hvac, structure related work.  

One bedroom still needs a kitchen, bathroom, seperate electrical panels, seperate HVAC.