I am having a really hard time deciding what Architect/Contractor I can use.

You don't necessarily need a licensed architect for the survey/scanning work it sounds like you are talking about. 

If the lot is 20k and the lot can be zoned for a modular home which would cost $X and should sell or rent for $X that can help buyers feel comfortable with the deal.Having contacts in the area like realtor, architects, and builders can help assess the zoning, structure, and cost for construction (also can be referred to the buyer if they are seeing this as a "package" deal).

Then ask to speak to fire dept. for the same reason: and then to public works: they will tell you. sometimes they will say: in theory you could do what you say you want to do, but you need to submit a formal request in planning and building with a drafter and or architect: at that point you will have to decide if its cost effective to do so.

Hi all, i'm getting ready to do my first brrrr and I need an architect to help with redesigning a place i just signed a contract on (Still in the "b" phase).

@Bruce HansenFor regular 1 story home conversions to 2 story.. the architect and structural engineer perhaps would need to assess if the foundation can supported the added weight for the additional.Since you plan to do this for a detached garage I am thinking other factors you may to consider (besides zoning) would be electric, gas?

Being an interior Designer and hopefully one day a full Architect I feel its important to also be involved in investment properties and real estate as a whole.Thank you in advance and I look forward to hearing your feedback!

Tons can be answered speaking with developers, builders,  architects, agents, the city. 

The architect submitting your drawings would know the code but a bedroom requires a window, closet, and certain square footage.

An architect can handle all that for you.