I want to use a cell number then get data from a cell 12 rows below the original cell

I have a database that I need to clean up.
I don't want to go through and delete all the empty rows as it will take me way too much time.
I have a 2 sheet spreadsheet. Sheet 1 has my raw database (names, address, phone number, etc). Sheet 2 will be used to collect data from sheet 1.

In sheet2 a2 i have done =Sheet1!A3 which returns the data 'John Citezen' (this is an example and not a real name), all good.

The next data I want to put in Sheet2 A3 is 12 cells below Sheet1 A3 (continues 24 cells below, 36cells below,48 cells below,etc). I don't know what formula to put in so that it will find my original cell (Sheet1A3) then bring back the data which is 12 rows below that cell.

I want to be able to put a formula in Sheet2 cell A3 which will bring the data from Sheet1!A15, then be able to drag that down to complete my data collection.

I have tried this in sheet2:
In Sheet2 cell A2 I have put the formula =Sheet1!A3 - This returns the persons name
In Sheet2 cell A3 I have put the formula=Sheet1!A15 - This returns the 2nd persons name
When i Highlight Sheet2 a2 & a3 and fill down, the following appears in Sheet 2 cell A4 --> =Sheet1!A5 which is not what i want. I want it to be =Sheet1!A27 --> and I want sheet 2 cell A5 to be =Sheet1!A39 and so on.

Thanks in advance for your time.

It's not pretty, but it works in A2 on down

=INDIRECT("Sheet1!A" & ((ROW()-2)*12)+3)

Thanks Chance2
Worked perfectly, but you already knew that didn't you?
I've modified it to gather all the other info (address, mobile number, email,etc) in the same fashion.

Thanks for your time.

(great experience from my first ever post)