The concept is pretty simple. I am a rookie so rarely measure out things exact but rather just what looks good. First of all it is important to make sure your compound is as clean as it can be through previous filtering.
Then pick the most non polar solvent you plan to run in the column and disolve at room temp all the compound. All process here is room temp. Generally a 4:1 ratio of solvent to compound will do it, then pour the disolved compound onto the Celite. I use Celite because it has a low affinity for extract compared to solvent and you lose almost nothing using it as dry loaing media. Using silica will work too but generally silica sticks pretty well to the compound so it throughs off the separation a bit. Sand could be used. However the further from Celite you go the more resolution problems you get.
Plus Celite is cheap.
This was a just for fun chromatography run but not DCVC. This is flash. Same ideas though. Here you can see the Celite loaded into a PTFE stirring dish. I estimate what would make a good slushy consistency. Then after it is mixed and air dried I use a mortar and pestle to fine grind everything together while it dries.
I put the compound in the vacuum chamber to aid drying. No heat for me but a roto would be sweet. It should dry completely and to the touch feel like talcum. I show the run part way through as it is being collected. This lab was to separate coloring agents and try to get a handle on which solvent system worked best. I chose flash instead of DCVC on whim that a longer column might provide better separation.