aiscripts can be made with notepad or any text editor. Hobbit’s waypointing tool (WaypointTool.exe) has a few special features for making aiscript files (keywords in color, right-click keyword help, error flags…). But if you don’t have Microsoft Dot-Net 2.0 installed then start with notepad.
aiscripts go in Wolfenstein - Enemy Territory\fritzbot\bots\scripts as described in the main FritzBot ET wiki.
Btw waypointing desert7 will be fairly easy. You will want to learn about and use the following .nav actions;
action_dynamite (obj: 4), action_defuse (5), action_roam (12), action_mg42camp (18), action_construct_major (19), action_plant_construct (32) and action_cmdpost (22).
You will also want to learn about the following aiscript keywords;
node_connect, node_disconnect, activateAction, deactivateAction, if_construct_built_false, if_construct_built_true, if_allied_cp_built_true, if_allied_cp_built_false
Once you read and understand how to add nodes, add connections, add actions, and the minimum items above you can waypoint desert7 in a few hours.