Generally effects that you want PRE amp model are stomps....overdrive stomps etc. EQ's can be used either pre or post depending what u r trying to accomplish. Post EQ will allow you ro EQ the distortion thats been created in the amp model. Putting it first basicall EQ's your guitar. The two are very different in thier effect but it would take a book to explain that so just experiment. Time based effects are generally put AFTER the amp model, especially if it's a overdrive sound because putting it PRE distortion stages will make the strength of the effect vary wildly if you lower the input signal. For example, lets say u have a delay before the amp or pedal distortion and with your guitar on 10 you have just the right amount of dealy. Lowering the guitars volume knob will change that setting and you will hgave too much. Or if you have a stomp before the amp and a delay before the stomp, stepping on the stomp will cause the amount of delay to multiply and you will have way too much. So delays should go after the amp model. Most other time based effects should too but can be used pre without similar wacky issues like u get with delay. Wah pedals usually are put pre but u can use then after too. Just sounds sorta overdone like that. In a nustshell i'd say just keep all stomps before the amp model and all delay and reverb after, and aside from that the rest are more subjective so experiment. U may like chorus before the amp mode instead of after for example. They just sound a little different and one way you may like better with distorted tones and the other you may perfer with clean. The main thing to keep in mind is that when putting any effect PRE amp model you are applying that effect to the guitar signal which is clean. Putting it POST amp model you are applying that effect to the amp signal distortion or clean. And second, with a clean amp tone none of this is nearly as important if at all. With amp distortion it's a huge difference because processing amp distortion with an effect is very different than processing the clean guitar input signal with that same effect.