bigger aspect ratio will it help me?

AntiVenom

Yes, skip the 35, go for 40 on the front, and 35 on the rear in stock sizes. That is unless you want to go wider. There are some performance advantages to wider tires, but unless you are gonna be driving your car hard, the stock tire sizes are going to be fine.

Yes, it will raise your car.

My suggestions:
-familiarize yourself with a tire size calculator
Tire Size Calculator & Converter, Tire Size Conversion | Discount Tire
this not only allows you to compare the difference in whatever tire size you might be interested in. it also has diagrams that explain the terms. if you are in to cars, this is critically important knowledge.

-nobody lowers their ride height by reducing sidewall size, or at least not anybody that is interested in the performance of the car. as you already know, doing this might lower the car, but it leaves you with unsightly fender gaps (i.e. looking like a 4x4). if you want a low car. get the right tire sizes and get some lowering springs (inexpensive way to drop your ride).