Some things to note...
First- Before you begin shopping measure your space to make sure the furniture you find will actually fit.
Second- Have a budget in mind for all furniture pieces and only look in stores that fall within that budget.
Step 3- Choosing a sofa.
I suggest starting with the largest piece first i.e., the sofa. When it comes to a sofa, I suggest going with neutral coloured fabrics made of material that will hold up well over time.
Above is the The Stylus Lyric Sofa which would work perfectly in our example space and is available at retailers across Canada. The price is around $1100.00 depending on the fabric you choose.
Step 4- Selecting a chair.
In terms of chair(s), you want something that co-ordinates well with your sofa i.e., they do not have to match but it is okay if they do. This may be a good place to bring a new texture into your space e.g. leather or rattan.
Above is the New Havana Chair from Crate and Barrel which co-ordinates well with the example sofa. The price is $599, the cushion cover is 100% cotton and the wooden legs are in a deep mahogany finish.
Anyone can add an area rug- even if your room has boardloom. In that case, my only suggestion would be to use a rug that is either patterned (if your boardloom is not and vice versa) or a different material (e.g. rattan). I prefer when a rug is large enough that all pieces are at least partially (front legs) on top of it.
Above is the Egeby flat, woven rug from IKEA. The price is $89.99 for a 6'5" x 4'4".
Step 6- Tables.
When it comes to buying the tables for a room their are many ways you can go. My feeling is just to go with the styles you like that fit with the way you intend to use the space i.e., if you intend to do a lot of entertaining, you may want more tables with a larger surface area for guests to put their food and drinks.
Step 7- Large and small accessories.
The accessories in a room are called that for a reason- they are the extras that help bring the room together and make it feel comfortable. My only suggestion here is to choose things that ;
1) you like
2) fall within your colour scheme
3) in addition to looking nice, serve a practical purpose e.g. a white throw blanket- looks nice on the back of your chair during the day but can be used to cover up with in the evening.
I think that pretty much covers everything...
FYI-This was the most time consuming poste I have written to date making it very obvious why professional designers exist.