Hello Reece, welcome!

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- there is nothing of real value there, other than my memories.
Hey, your memories have real value too. There's a lot of memories in stamp collecting and that's part of the whole thing. Good you're keeping that old album.
Selvage (British / Canadian / Austalian = selvedge) or margins are a personal choice on whether to keep or not I think. I like it when stuff is printed on them, like on newer stamps from Canada say, where extra pictures and lots of info is on them. Like printer's name, designer, etc.
I remember as a beginner I would rip off all the extra bits so I was left with just the stamp, but now as a seasoned (read well used) collector I tend to keep some and rip off some. It is really up to you.
To sell that stamp later on, some folks want the selvage, some don't. Depends who you sell it to, if you sell it at all. You might even change your own mind over the years and do things differently later on then you do now.
And Don't use scissors! Get them away from your stamps! Too much chance of a slip up or something.
You can use a straight edge to help rip cleanly but folding gently back and forth usually does the trick. I've seen post office clerks do this also years ago.
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I've also found a regular photo album
Oh no, if that is the type that uses the 'magnetic' type of glue lines to hold photos in, then get the stamps out of there as soon as you can. Usually that type of album will leave glue lines on the backs of anything stuck in there. Ruins stamps because you can't get that glue off usually.
There are stamp singles, blocks of 4 or 6 or 8 or whatever, corner blocks of four or whichever (with no plate number), plate blacks or whatever (4,6,8,etc) that have the plate number somewhere on the selvage, and blocks of whatever number of stamps you want.
Some collectors want these. There are collectors of plate numbers (blocks usually), collectors of just corner blocks (as new stamps don't always have plate numbers like the older ones did). Sometimes you lay have a collection with single stamps, a block without any selvage, and a cover of any combination of these types of arrangements.
There is no hard and fast rule. Some album manufacturers print there pages one way and others do it another way. Some collectors make their own pages to suit themselves.
You can rip them apart into singles if you want although if you later want to collect or trade blocks you will be sorry. But it's up to you and you finances too, but sometimes it's best to wait a year and see how you feel later on when you know more and have seen more collections perhaps or read more on Stamp Community.
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Is there any added value to having two seemingly regular stamps connected?
If they are different stamps (different designs) attached together then they are called se-tenant (French) and some collect these.
But the same stamp over and over (called multiples 2, 3, 4, 5, etc, strips, blocks, panes, sheets) sometimes are collected by people, sometimes not. Advanced collectors like to have multiples to show how the stamps came originally. Sometimes it adds to the visual appeal of an album page display.
As a rare or really old (and rare) stamp in multiples, those would be worth a lot more, but as a new modern (1950's and on) stamp, well, you will have to search for a collector who likes his stamps that way and some do but some don't. Some will just go by what the album wants them to do, which can be limiting after years of seeing and wanting all varieties of a stamp or seeing how multiple stamps display better.
You have to almost add in extra pages (called blank or quadrilled (faint grid lines on the paper to help you line up the stamps) or design your own or print your own from off the web, etc.
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Is there a place online that will allow me to search by denomination in order to help identify year/Scott numbers?
Depends on what search program carious sites use.
ebay can be used that way but not all sellers list the denominations of their stamps. Or Bidstart, or PostBeeld or just Google it in pictures and see what comes up as some name their picture by the denomination (but not all).
Or post some pics here and ask (start a new thread out in the regular forum that is) or go to the library and get out an older Scott's stamp catalogue (for the US) and have fun learning more stamps knowledge than you ever thought existed.

There are probably sites that list US stamps but a lot of numbers are copyright by the catalogue makers around the world.
Software would certainly help. I think EzStamp is one.
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gobs of used . . as most of it would be considered worthless to collectors.
Aaaaaaah!! No! It is all good! As a collector of used, there are varieties of each stamp sometimes, and cancels and postmarks are always collectible. They help tell the story of where the stamp has been and what it has done. Especially multiples of stamps with a cancel that is on more than one stamp. You separate the stamps and you lose the cancel.
That's it for me. Asking more questions like these (good questions!) out in the regular forum will get you more responses quicker as not everyone looks in here in the members section all the time.