EViews.com

I am not sure if there is any specific justification to use 12 lags for monthly data. On the ECT, I think the procedure is right. But will suggest you go back to microfit and use it ( with different lag specification) until you get to ecm, then lift it (ect term beneath the result, then go to Proces...

go ahead

Try stationarity tests with structural breaks such as Zivot and Andrews (1992) Lee and Strazicich (2003, 2004). These may turn the series to at most I(1). I think you can use ARDL, if the series are I(0) and I(1).

the bound test can be easily done in eviews via: go to Estimate and specify your Equation under LS-Least Squares(NLS and ARMA): like d(DV) c dDV(-1 to -4) dfirstIV(-1 to -4) dsecondIV(-1 to -4) DV(-1) fisrtIV(-1) secondIV(-1)and so on then go to View-- Wald-Coefficient Tests--Coefficient restriction...