Can anyone pls recommend good strings for Electric Guitar?

I am so lost when it comes to the selections:


I got a second hand ION E-Guitar w/o string and I am trying to make use of it. Any comments and help are appreciated!

I also need help with saddle.
1 out 6 screws has no string on it (on E--thin one), should i bother to find a string to install it? or I need to replace the entire saddle?

Thanks again..
for strings dr's or ernie balls. those are my favorites at least. and for the sadle, you can probably find peices everywhere