My first sentence is about, if I am reporting an issue and writing down a step,
Sentence 1:

On the admin side, just navigate to the home page.

or

At the admin side, just navigate to the home page.

Sentence 2:

I am going on my room.

or

I am going at my room.

or

I am going to my room.

or

I am going in my room.

Sentence 3:
I am on the ABC road.

or

I am at the ABC road.

Please can you describe the preposition rules to me? I am very confused while making a sentence with "at" or "on" or "in".
 
Thanks!
1. On the admin side, ...

2. I'm going to my room. / I'm going into my room.

3. I'm on the road.

For more on "in", "on", and "at", see A sentence

CJ
Would it be correct if the 3rd one is written like,

I am on ABC road.

Consider an example, if I am going to some place and someone calls to me, and asks" Where are you?"

then, My answer will be,

I am on or at ABC road.

Thanks!