Logo top right twenty eleven theme in child theme

I just started with WordPress to create a site. I have some questions about stuff I could find on the forums, or where previous posts didnt solve my problems.

I am using the twentyeleven theme and I succesfully created a child theme. The site is https://www.randommoves.nl. I am using Chrome to find/edit code. Child code looks like this:

/*
Theme Name: child
Description: Child theme for the twentyeleven theme
Author: Bart
Template: twentyeleven
*/

@import url("../twentyeleven/style.css");

/* Search Form */
#branding #searchform {
	display: none;
}

/* Page title size*/
.singular .entry-title {
	color: #000;
	font-size: 24px;
	font-weight: bold;
	line-height: 48px;
}

I have three questions that I could use some help with:

1. I would like to make the space between the menu and the page-title smaller

2. I would like to move the whole page content (page title and the content itself) a bit to the left

3. I would like a logo in the topright part of my site. I have a jpg file called placeholder.jpg in the same folder as my child theme.

I am a newbie with WordPress, so please post the whole code I should put in the child theme, don’t assume I will do the obvious stuff myself.