Bert, I still think you should read what Ilford says at least for the first try:
Instructions for agitation etc, it is all in there. It might be a good idea to start with an EI of 125 and the recommended development time to get a "baseline" test.
As Brian says you might have to try a few different EI settings and development times to find what works best for you. This depends on your own aesthetic preferences, how you print, your subject matter etc. If you want to give a little more exposure to the shadows and have slightly softer overall contrast, using an EI like 64 or 80 and 9-10 minutes development might be nice. This is in line with what Ilford recommends (for example at a 1+1 dilution for ID-11, and an EI of 50 for FP4+ Ilford recommends 8 minutes at 20C).
Regarding your question about mixing in the other thread, mixing it a day in advance makes things a little easier because then you can leave the solution overnight to cool to your working temperature (you mix it at a higher temperature). Follow Ilford's instructions for mixing ID-11.