Hello,
I've been building for 10+ years in Texas. If I were you this would be my game plan.
1. Go to https://www.architecturaldesigns.com/ and pick out your house plan. (you may want to pick out several based on different lot situations)
Based on your plan you should be able to get estimates, You can either go to builders with their plans and ask them their cost to build pre sq.ft. or sq.m, or you can get actual pricing based on your plan. One option is to go to neighborhoods where they are actively building and meet the carpenters, plumbers, hvac, electricians, that are doing the work. Also you should try to find a construction manager and take them to lunch, they should be able to give you guidance on cost to build.
2. Identify a property to build on, I don't know in Nova Scotia what the replat or subdivision rules are, but locally we can typically purchase a property and do a minor 1 lot into 2 lots subdivision process in less than 6 months.
(Things to look for on your lot.
1. How level is the lot?
2. Is the lot Cleared?
3. Will the lot require a retaining wall?
Before contracting on the lot, you should check with the local municipality to verify building requirements, current code requirements, list of required documents, surveys, soil tests, engineered plans, etc.
Once you have identified your lot and finalized your estimate its time to build.
You or your GC will get the permits.
For the final build, there are 2 ways to build, as either a cost plus, or fixed price project.
Hope this helps, let me know if you have additional questions.