imlne wrote:Should I make a starter?
Of course - always make a starter with liquid yeast.
imlne wrote: How much Magnum should I use? I don't want the hops to compete with the spices.
You want to keep the IBUs low. Magnum is a bittering hop only so don't use it for anything but a 60 min addition. I woudl target around 12-20 IBUs.
imlne wrote:How much of the spices should I use?
Hard to say - use a restrained hand. You don't want to taste the beer and say "that's corriander!". The trick is to add just enough spice to leave the drinker saying "hmmmm, what is that?" Maybe start at around 6-12 grams. A lot of time belgian yeast is spicy enough that you might be better off brewing the beer without spice first so you know what character you are getting from your yeast. You can always add the spice in the secondary, too.
imlne wrote:Any thought what the OG might be?
I highly recommend getting a recipe formulator. There's an online one at
http://www.tastybrew.com - you need to figure that stuff out for yourself.
Also, if you are really interested in brewing Belgians pick up the book "Brew Like a Monk" - it is an essential guide tot he style.