I want a map that always produces two times the original gold mines and well spreaded.

That is easy to do, you just need to modify the rms file of the map. Here is the most complete guide on the subject:
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I am unable to understand a little of it. Could you please make one for me and share. I m tired after several tries.

I'm currently busy porting the dialogue of Gurjaras, Begalis and Dravidians and later I'll have to do the upcoming balance changes in order to publish an update of the Community Patch with Gurjaras implemented. Don't expect me to do that map in the near future.

Let me have a look at any tutorial if possible.

Scripting and Testing
Standard Units and Resources
The standard (DE) starting resources per player are:
1 group of 6 forage bushes at least 10 tiles away
1 group of 7 gold mines at least 10 tiles away
1 group of 4 gold mines at least 18 tiles away
1 group of 4 gold mines at least 21 tiles away
1 group of 5 stone mines at least 12 tiles away
1 group of 4 stone mines at least 16 tiles away
1 group of 4 sheep at around 7 tiles (if cows/water buffalo, use 1 group of 3 instead)
In competitive maps, 1 of these often starts under control of the player.
2 groups of 2 sheep at a shared variable min distance (14-24) away (if cows/water buffalo, use 1 group of 3, or 2+1 instead)
2 individual boar at least 16 tiles away
1 group of either 3 or 4 deer at a variable min distance (14-24) away
1 individual predator at least 34 tiles away
2 individual trees at 4-5 tiles away
3 individual trees at 6-8 tiles away

how to use these and where is map download? How to make changes?

Everything you need to know is in the guide I shared you earlier:
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There it explains how to find the scripts and I'm sure it will give some indications on how to change the ammount of resources of the gold.

This is easy but the uniform spreading of the mines may be a problem. I would suggest you double the capacity of the mines instead. You can do this by using the delta object:

===
create_object GOLD {
number_of_objects 10
resource_delta 800
}
===

You can change the number of objects to your preference.

Aaah I want a uniform spreading please help me out guys

But first of all how I need to download the required things, and where to download?

You need to have some knowledge of rms scripting. RMS Scripts can be edited in any text editor such as notepad++,VS Code etc

Hahahahahahaahhaha that is very great! Never got it anyways!

But may be could you give me a sample script. So that I could copy and try!

Please help me out I am getting lost at hope.