Windows 7 with 1gb RAM

Hi.

I am installing Ubuntu 12 onto a 20gb ext3 partition. I have 100gb free disk space.

The install asked me to choose a swap space. Do I have to allocate another partition for the swap space, and if so, what size should it be?

I installed without allocating a swap space. Can I allocate a swap space after the install?

The install asked me for a mount point. I chose /. Is this okay?

I also want to ensure that GRUB2 will be installed within the UBUNTU partition. Is there an option for this on the install? (I will use EasyBCD to select Windows7 or UBUNTU.)

Thanks for your help,

M...