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good advice from @joesh there

but also add - read a lot of newbie posts - especially ones where they want to make similar music to you

in addition to the go to modulargrid - the best advice is to not worry about the size of the case to start with think about
- what modules do you want
- what modules do you need to support the modules you want

this almost definitely involves asking advice on forums

once you have this add 30% extra for expansion and you will have the size of the case that you need

at the bottom of the rack you will see the power requirements of the modules - for any modules that don't have power draw listed - and for expansion hp, I use 10mA/rail/hp as a rough guide for power requirements

add up all the power requirements and then add another 25-30% for overhead - this is needed otherwise you may have issues, especially when turning the modular on as some modules use significantly more when starting up than when in a normal running state (mostly digital ones)

small cases are often a false economy as they are usually very expensive per hp and fill up incredibly quickly - they are great for taking a few modules from a large rack in order to focus on them (learning a single new module for example) but are really not so great for starter racks