Wireless Network Help

Ok so im fairly new to computer craft and I dont know much about programing. I have a program i made saved on a disk and the drive is connected to my computer. I have a modem on my computer and a wireless crafty turtle. How do I turn on the modem and connect my turtle to my computer. Also would I beable to run the program thats on the disk through the network and have it run on the turtle?

What you need is the rednet API.
http://computercraft.info/wiki/Rednet_%28API%29
As for your other question, you can, but it's gonna take some programming on your part. As you'll have to transmit the program wirelessly. There's no pre-installed function to do this.

When you've read the link above posted by CometWolf, You can run the program that's on the disk through rednet
Sender( Computer )

rednet.open( "<Side>" ) -- Change to the side you have the modem on
local args = { ... }
if #args < 2 then
	error( "Usage: <Filename> <ID>", 0 )
end

if fs.exists( args[1] ) then
	if not tonumber( args[2] ) then
		error( "ID must be a number!", 0 )
	end
	local file = fs.open( args[1] )
	local code = file.readAll()
	file.close()
	rednet.send( tonumber( args[2] ), code )
else
	error( "File doesn't exist!", 0 )
end

Receiver( Turtle )

rednet.open( "right" ) -- Change 'right' to the side you're using, Right is usually the default on wireless turtles
local _id = 0 -- Change 0 to the computers id, This is to prevent from other computers sending to this turtle while it's listening

local id, code
repeat
	id, code = rednet.receive()
until id == _id
local func = loadstring( code )
func()

To get the id of the turtle and computer just type id then press enter in the shell and it will show the id.
This is just a simple example of how you can run the file that's on the computer on the turtle without actually creating a new file on the turtle.