I am working on my first recipe creation for an extract brew using light DME as a base plus steeping grains. I am concocting a variation of a brew that uses Carastan, Crystal 75, and Munich (not necessarily in that order) on the grain bill. My plan was to steep 1# Munich, .5#Crystal 75, and .5# Carastan and then complete my wort with 7lbs light DME. I then read somewhere that Munich needs to be mashed which I am not familiar with. Can I use that? Do I need to substitute it? I'm not completely sure what each grain brings to the table or what they will add collectively. I've done all extract kits, some with and some without steeping grains. I understand the base DME and LME and what they bring to the table and how to balance with IBU's and the hop schedule. Any advice would be appreciated.