Zelos alot of you questions can be answered by the 'Object Browser'.
It is located in 'View -> Object Browser', or just hit F2!
Here you can find (almost) all commands for Objects (picturesboxes etc.) and also other simple commands, though not all commands in VB is here (why I dont know).
In VB when you want to make something to an object (picturebox, text, label etc.) you often need to call their corresponding function:
example
'objectname.function parameters(for the function)'
For the progressbar, you set it by this:
(you can also set it in the properties on design-time, some objects have an additional properties window, to find it right click on the object in question, can choose properties, if it has an additional properties window it will popup)
'Sets the minimum for the progressbar
ProgressBar.Min = 0
'Sets the maximum for the progressbar
ProgressBar.Max = 10
'When you need the progressbar to increase in value you write
'Were x is the value it should be increased with.
'Beware that if the .Value, gets over .Max it will raise an error!
ProgressBar.Value = ProgressBar.Value + x
You need to threat all Objects/items in VB as real objects, like when you want to turn on you TV, you dont say just TurnOn... You need to use something like (okay I know, but it is just an analogy)
'If you use the remotecontrol
TV.RemoteControl.TurnOn = True
'If you push a button on the tv, it will be:
TV.TurnOn = True
(Bad example, but I hope it can be used to something)