Can't remember my 1st model, but like many on here I started with Lego/Fischer Price cars, then progressed onto 1:24 Monogram and Revell plastic car models and 1:12 Tamiya F1 model kits
Once I got my driving license it was onto a full size kit car which was a whole new world of fun and expense
Still collect model cars but now only of cars I've helped create, started with 1:18 but it all got out of hand so I scaled down to 1:43, have over a 100 cars waiting for me to build a display case for.