How to store methanol
One of the first places to look at for advice is the Materials Safety Data Sheet (MSDS, or just SDS). Make sure these are kept in a handy place and are up to date. These should be provided by the supplier (but are easy enough to get online).

A pertinent and thorough guide is produced by the aptly named Methanol Institute, the document is called Methanol Safe Handling Manual, the chapter Health and Safety, especially the Safety Precautions subchapter outlines the following:


  
  Smoking must be prohibited.
  Vehicle access should be strictly controlled.
  Ventilation must be sufficient to cope with the maximum expected vapor levels in buildings.
  Positive pressure may be required for methanol-free areas, such as control, switch, and smoking rooms.
  Storage tank vents to atmosphere should be sized for fire-heated emergency vapor release.
  Electrical equipment must be explosion-proof to meet national electrical code requirements.
  Alcohol-resistant Aqueous Film-forming Foam (AR-AFFF) with 6% foam proportioning (with water) equipment is advised for use on methanol
  fires.
  Dry chemical extinguishers should be accessible for small fires. An adequate supply of handheld and wheeled types should be available.
  Hydrants should be strategically placed with adequate hoses.
  Small spills should be remediated with sand, earth, or other non-combustible absorbent material, and the area then flushed with
  water. Larger spills should be diluted with water and diked for later
  disposal.
  Lighting should be grounded. Tall vessels and structures should be fitted with lightning conductors that are securely grounded.
  


These kind of directives should be on signs that are easily read alongside hazard signage.

I would suggest having a readily accessed first aid kit and make a poster with first aid instructions, also included in the handbook - First Aid Measures

In terms of storage, the subchapter Methanol Storage, the handbook states that


  In general, fire protection for gasoline tanks is sufficient for
  methanol tanks, provided extra precaution is made for leak detection, toxic hazard, and
  availability of alcohol-compatible fire suppression foam.


In terms of proximity to the house, I would consider storing these tanks as far as feasible from the house.