If the basement has a seperate shut-off then I normally keep the ball valves at a 45 degree point when I complete my fall blow-jobs (1/2 way between open and closed). These can freeze and split if they're left fully open or fully closed because water is trapped behind the ball when it's fully open or fully closed.
Always turn ball valves open and closed very slowly. Turning fast will cause a water hammer and could cause damage to pipes, fittings, and devices.
Start by turning the water on inside your home and work out to the irrigation system. Open valves very slowly to let the pipes fill up with water. Normally I have one sprinkler (zone) valve open (manualy) at this point to relieve pressure and to vent air in the system. When each zone fills with water and is running for a few minutes I check the pattern and flow of each head. It's important to re-set the heads (if needed) at this point and make sure that they are verticle, clear of turf overgrowth, and set to the proper height.
Open the next zone valve manually, again slowly to fill the line with water and displace the air. Then close the previous zone valve. Continue checking and re-setting heads as needed, and follow the steps of open next valve before you close the previous valve. I do this to keep any water hammer pressure down to a minimum.
Get your backflow assembly tested.
If you do have a Pressure Vacuum Breaker (PVB) type of backflow assembly, you will have to open the first shut-off very quickly to seat the head. This is the only time that you open ball valves quickly. When you do this mak sure that the second shut-off is still closed.
A PVB is the same type backflow assembly as in the previous thread asking about "water pours out from sprinkler turn on".
If I didn't answer your question because I went on about the wrong "screws", please let me know.