tiling damaged brickwork wall

[mlatif]

Hi,
I am currently replacing my bathroom tiles. My bathroom was half tiled. I want to tile it from floor to ceiling. Removing the old tiles uncovered another layer of smaller tiles behind the main big tiles. I removed those too. Now I am down to the plaster layer. This now has a lot of remaining old adhesive. Some area where i removed the tiles uncovered the main brickwork which is slightly damaged and has holes in it.

The area that wasnt tiled has plasterboard which i am thinking of removing too.

Questions:
Do I remove the plasterboard totally and start from scratch?
What do i do about the old plaster layer (with old adhesive on it)?
How do i repair the brickwork? Cement and sand?
Once the brickwork is repaired and flat, do i plaster (what do i need) or install plasterboard (how)?

Much appreciated.
Regards,

[welsh brickie]

the old wall tile adhesive can be removed with a steam stripper and a scraper.
To fill in the holes you can use drywall adhesive.
If you want to take the lot off and start from scratch,you can dryline the room with plasterboard and fix it with drywall adhesive.