Try the Commands Troubleshooting and Help page if you get stuff with server errors.
Minecraft Pillager NBT Data Tags
Using the summon command to spawn in a minecraft pillager is simple, take the command and enter into chat and presto you have a pillager. Pillager are part of raids.
Pillagers have Inventory ... still working on this one.
Illager Patrols
Setting Patrolling:1 and PatrolTarget coordinates will make illagers to move towards the patrol target.
/summon minecraft:pillager ~ ~ ~ {Patrolling:1,PatrolTarget:{X:100,Y:65,Z:400}}
Add a patrol leader PatrolLeader:1 to allow for players to receive the Bad Omen status when slaying the patrol leader.
/summon minecraft:pillager ~ ~ ~ {Patrolling:1,PatrolLeader:1,PatrolTarget:{X:100,Y:65,Z:400}}
Illager Raids
Unfortunately setting the raid tags doesn't seem to create a raid, maybe someone would be able to work these tags out.
Suggestions or found a bug
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If you're looking for a particular summon mob generator you can link to these specific versions of the command generator.