Here are a few pictures and descriptions of some of the items that you may see in your proposal to help you understand it better.
Lead plumb pipe flashing:
Provides a watertight seal completely protecting roof penetrations and is recommended for all types of roof pipe penetrations.
The all-lead seamless riser flashing provides a watertight seal and completely protects the penetration. Lead flashings have superior characteristics such as malleability, corrosion resistance, expansion and contraction and are suitable for all climates.
Baked enamel metal Stem vent:
Stem vents are used for venting the bathroom exhaust and the kitchen fan. The existing duct that is connected to the fan is attached to the bottom side of the stem vent to vent the fan. They have a wire mesh to help keep small bugs out and a damper to keep water out.
Baked enamel metal Attic vent:
Attic vents are an effective and energy-efficient way to ventilate your home. These products keep air flowing to reduce heat and moisture and lowers the burden on your air conditioning unit. These vents also protect your roof from premature deterioration.
Shinglevent II Ridge Vent:
Ridge vents are installed on the peak of the roof allowing exceptional exhaust ventilation all along the roof-line. This helps prevent attic heat buildup and humidity by continuously moving air along the underside of the roof. Less then an inch in height, these seem to blend into the house and disappear into the roof. This is a great alternative to the metal attic vents shown above. Depending on the design of your roof, the ridge vent may be a great solution.
The edge vent is used when there is no eves to install intake ventilation, the edge vent is a great vent for providing continuous intake air flow. the Edge vent by Air vent inc. is a over the shingle design.(as seen in the picture this was installed under the 5th course of the shingle)
Baked enamel 24" Valley metal:
Valley metal is used in the valley where two or more intersecting roof planes come together. A roof's valley drains more water down this area of the roof more than anywhere else on the average roof. For this reason, we want the most durable materials in this location
Shadow Ridge accessory shingles are designed for the hip and ridge of the roof. The shadow ridge shingles seems to blend in with the field shingles with its low profile look. (as you can see on this ridge.)
Mountain Ridge accessory shingles are designed for the hip and ridge of the roof also. The Mountain Ridge shingles have a very high profile look that seems to accentuate the architectural design of the roof. (This option is an upgrade from the standard shadow ridge shown above.)
Edge metal is installed on the gable end of the roof, covering the edge of the plywood and lapping over top of the gable boards.
Gable wrap is made from a hip and ridge shingle and is also installed on the gable end of the roof instead of using the edge metal. It covers the edge of the plywood and lapping over top of the gable boards. (the gable wrap is not a common practice today)
Skylight 2x4 Velux:
Velux skylights are perfect for visually expanding areas such as hallways, stairwells, and other closed-in, dark spaces that can be transformed with light and sky views. They provide an economical choice in creating a spacious home that is filled with natural light.
3 Ply System:
In areas where the roof has a very
low slope or is flat, Its recommended to use
the 3 ply roofing system which is composed
of a Nail base then a layer of Mid Ply and
then finished with the Cap sheet to help
minimize any water intrusion.
Intake ventilation is a critical part of venting the attic space during the summer and winter months. Proper ventilation helps to exhaust the heat and moisture in the attic. There also needs to be adequate exhaust ventilation at the ridge as well.
This picture shows the flashing at the chimney, Included with your proposal is the "step flashing" a mason would need to install the counter metal that is cut into the chimney and redirects the flow of water over the top of the step flashing.
This picture shows a "bargeboard" it is the board that is fastened to the projecting gable of a roof to give them strength and protection. If dry rotted the best time to replace is while roofing.