The Barn Siding look.
Unless you are planning a brand newly painted structure, weathering to some degree will be required.I like the old ,to really old look, for my structures.Old,well used,grimy, oily etc...Depending on the subject, it can be total mess or fairly orderly.Anything military would require a certain neatness about it,civilian its your choice.Actually messy and old is easier to do than clean and neat ,once you get weathering techniques and "thinking messy "conquered. Anything clean and neat and it is easy to spot mistakes,old and messy you can just cover them up.But messy has its own challenges too.For some reason we instinctively like to line things up in orderly fashion. Example:we plant tree in rows ,space them evenly and usually put them 90deg to one another.But the natural order of things, in 1:1 scale, is usually the opposite.
When planing a scene I often have to stop and think "how can I screw this up to make it look more natural".It is a surprisingly difficult thing to overcome.
One big problem is making things too shiny,even cars in showrooms have a little dust and fingerprints on them.Shininess on figures can be a disaster and can spoil an otherwise natural looking scene and make the whole thing look toy like.A lot of modelers seem to go to great lengths to avoid doing figures, and being tooo shiny is a major reason why.You can do nice dioramas with no figures at all ,but a car with no driver, driving down a busy street with no people ,looks just a little strange to me.(something like the TV series "Life after Man")
Once you have the kind of structure you want in mind then you will start to gather a few supplies.I like wood,nothing looks as natural as real wood but you have to be careful to pick the proper species for the scale your working in, unless to plan to completely cover it with paint.The easiest hobby wood to obtain other than balsa(don't even think about it) is basswood for building weathered structures.Select pine from the lumber yard is ok too but you really have to watch for the growth ring patterns.Hardwoods ,for general structure purposes I would avoid, as I would nails for putting it together.Why ? simple answer broken drills.Use wood pegs instead or use glue and fake the nail heads.
Basswood in small scales is usually available in hobby stores that supply the RR guys, as they have been using it a long time.For larger scales I have seen on occasion scale basswood in framing shops.The larger stuff is usually easily available from lumberyards or woodcarvers supply houses.I use a lot of select pine in my large scale structures,which I buy already cut to size or I trim it myself on my band or scroll saw.For the smaller scales just about everything you will need comes pre-cut although you may have to compromise a little on scale.
Plywood is usually available anywhere in most thicknesses but use only the best stuff for hobby work,usually clear white birch. to be cont......