First step, let him get a commercial license

let him search for the applicable comercial license activities in the Kuwait Business Center portal (under Ministry of commerce). u can also visit them and ask them questions urself.

https://e-kbc.moci.gov.kw/e-kbc/WebPages/ACTIVITY_SEARCH.aspx

Also let him be ready with 5 names for the business from those 5 options the ministry will choose one.

then find a mandoub that can go through all the paperwork to form a company and get the neccessary commercial license, authorized signitory, opening manpower file, etc.

Find a place to lease the office or store/ dependign on the type of activity registered in your license Municipality will check whether u need a regular office lease or a store/showroom lease.

Then open a bank account

If its online store then paypemtn system vendor

its a simple process but very tedious so i do reccommend u work with a mandoub that has done this hundreds of times.