You stated "
I am looking for a place to look up the worth of my stamps."
First you have to identify the stamps by asking... here on SCF for example. With them identified you look at similar stamps on sale on sites such as
ebay to get an estimate of their "
worth". As you are "
new to this" then you will soon learn that a catalog value of your stamps will be nowhere near reality.
You have two GB stamps... both will have probably been issued in the early 1960's with multiple crown watermark. Their value is low even though the stamps do look in good condition. The postmarks will detract from their value for instance... many collectors put greater value on clear,clean circular date stamp type postmarks but, even then, the value of the stamps is still low.


Your six pence stamp has slogan postmark dating from 1963. Even a complete slogan postmark on cover (envelope etc) would not raise the value much.
"
I have tons more"... I look forward to seeing more in that case.