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I think the Antarctic bases (in particular the largest - McMurdo Station) are our best reference point for the first Mars Colony.

Here are some details about McMurdo station, which has a summer population of over 1000 and a winter population of around 250. 

From Wikipedia:

"Today, McMurdo Station is Antarctica's largest community and a functional, modern-day science station, which includes a harbor, three airfields[8] (two seasonal), a heliport and more than 100 buildings, including the Albert P. Crary Science and Engineering Center. The station is also home to the continent's two ATMs, both provided by Wells Fargo Bank. The primary focus of the work done at McMurdo Station is science, but most of the residents are not scientists, but station personnel who are there to provide support for operations, logistics, information technology, construction, and maintenance."

"More than 85 buildings with facilities that include:[1]

    A harbor
    Landing strips
    Helicopter pad
    Repair facilities
    Dormitories
    Administrative buildings
    Firehouse
    Power plant
    Water distillation plant
    Wharf
    Stores
    Clubs
    Warehouses
    Crary Lab
    Above-ground water, sewer, telephone, and power lines
    Chapel of the Snows Interfaith Chapel
    Albert P. Crary Science and Engineering Center (aeronomy and astrophysics, biology and medicine, geology and geophysics, glaciology and glacial geology, and ocean and climate systems)."

How might a Mars colony of 1000 look? 

Spaceport where the BFRs land and where rocket hoppers take off to explore the planet.
Spaceport reception facility (where newcomers are given a full health check)
Photovoltaic power facility.
Battery storage facility
Methane production and storage facility
Rocket propellant production and storage facility
Administrative Centre (General Director and various public officials covering such areas as: Health and Hygiene, Mining and Supplies, Industrial Production, Agriculture and Food, Scientific Programme)
Space X Offices
Science Centre (geology, geophysics, glaciology, biology if relevant, medicine)
Mars University Institute (a post grad study and research facility funded and overseen by a consortium of Universities including Harvard, MIT, Cambridge UK, and Bologna).
Health Centre (general practice, surgery, A&E, pharmacy)
3 Warehouses
Distribution and Retail Centre (for free distribution of various items e.g. basic clothing, hygiene products and also sale of luxury items)
Agricultural Centre x 5  (producing about 80% of the colony's needs or about 1200 kgs of food items per sol).
Food Processing and Packaging Hab
Transport and Mining Hub (storage and maintenance of 20 small Rovers and 10 large Rovers used in exploration, plus other mining machines)
Exploration Centre (centre for exploration planning and co-ordination)
Life Support Facility x 5 (producing oxygen/air mix and clean water, monitoring pressurisation of habs, maintaining hygiene, and dealing with human waste/waste water, venting of gases etc) 
Space Agency HQs (NASA, ESA, ISA)
Industrial Resources Centre (sited well away from main habitation - storage of industrial materials such as gases, metal ores, mineral  etc)
Industrial Production and Design Centre (organised into several divisions dealing with: electrical equipment e.g. electric motors; plastics; steel production; 3D printing; general manufacturing; PV panel production; rover vehicle production; construction materials)
Emergency Services Centre (fire, life support emergencies, meteorite protection, rule infringements, restraint requirements)
Media and Communications Centre (film editing suite, press room, Mars TV production centre, Earth-Mars communication,  communication with mining outposts, Mars satellite communication, Radio/TV station for the colony, colony website, Mars internet).
Habs x 50  (average 20 persons per hab, each with central kitchen facility)
Gym
Sports and concert hall

Of the 1000 people maybe the following breakdown would be realistic:

50 -  Agriculture and food production
100 - Industrial production
300 - Scientific research projects
50 -   Mars University Institute
100 - Mars exploration projects
50 -   Mars mining
10 -   Medical staff
100 - Media and Communications
20  - Warehouse
50  - Central Admin
30 -  Space Agency staff
10 -  Space X admin
30  -  Spaceport and rocket preparation
20  - Methane and propellant production
10  -  Transport Maintenance
20  -  Retail and distribution
50 -  Life Support and Waste Management
10  - Emergency Response
50 -  Construction
10  -Gym and sports hall management
10  - Habs Support and Management

(Some jobs would be part time)