You can do two things to create the arc:
Q- I would like to create that advanced curve on the first page,how could i do this?
1. use an Elipse tool to create the arc
2. use the Pen tool to draw it and then adjust the beziers afterwards
Q- Then onto page two the plastering advert, how could i have an image like that in the background? The image is the hand and the plaster towel
Create a frame and place your image in it and send it to the back
Create a text box and send it to the front
Q- On page 6 there is an electrician advert, i would like to know how i could create the electric style points.
you can load your own font that has your special character and set your bullets to that font via the Character Styles palette and define a new Character Style/Basic Character Formats and choose the font family that has your special characters from the dropdown menu.
Q- And on page 12 there is another electrician advert, i am interested in learning how to create the bright flashing light next to ac.
Use Photoshop to create the graphic and import it as a PNG with transparency
I hope this helps you solve some of your questions.
I'm going to expand on the previous answer just a bit.
For the curved corner area you woukld set the fill to [Paper], then in the Effects panel set the opacity of the fill down a bit to let the background show through. If you need punched out text as well, see http://indesignsecrets.com/indesign-eye-candy-part-3.php for one method.
For the lightning bold bullets one good way to make a custom font would be with IndyFont. You can use the free trail for a one-character font: Indiscripts :: IndyFont
For the graphic on page 12, Illustrator might be a better choice than Photoshop, and if you do decide to use Photoshop I would not save as PNG for print output. Use PSD or Photoshop PDF instead.
I'm also going to recommend a good starter book since these are pretty basic questions: Sandee Cohen's Visual QuickStart for InDesign.