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Are these albums common?
No. There are people that collect old albums, but it's a niche market. The album has value ... do not throw it out!
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Would it be best to keep it together and sell as a whole or separate the stamps and sell them individually ?
I'm sure you'll find more than one opinion on this question. I think it's ok to separate and sell these stamps. Some of these will require a little groundwork on your part to determine watermarks, plate #s, grills, and condition.
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Which countries stamps are on average are most valuable? I have only looked at the first page (Britain) and the first stamp a 1840 queen Victoria black stamp seems to valuable.
Generally speaking, the most valuable will be the items from countries where there's demand. US, British commonwealth, Germany, and China are always in high demand.
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All the stamps are older than 1870 is there any specific stamp/date I should look for that might be very valuable?
Not all of these stamps are pre-1870. I can see some US stamps that date from the 1890s. I'm sure there are many more to be found.
As a rule, there are a couple of things to look for if fishing for valuable stamps.
1) Condition, condition, condition. Catalogue values are for sound (undamaged) condition with Very Fine (VF) centering unless otherwise stated by the catalogue. Values for Damaged stamps drop dramatically and a discerning collector will never pay catalogue value for an item with flaws.
2) High face value. As an example, the US 24c George Washington stamp catalogues at a minimum of ~$200 in sound condition with VF centering. There are a number of varieties of this stamp and values skyrocket for the uncommon types. This is where you need to know what you have before trying to sell.
3) Old does not necessarily mean valuable. Letters were the only means of long distance communication in the 19th century. As such, stamps were issued by the billions upon billions. Most US stamps with low face values (esp 2c and 3c stamps)are so common that they are only worth from .25 to a couple dollars from this era.
There are exceptions of course!
I would recommend taking some high-resolution photographs and posting new threads in their appropriate forum (US stamps in the "Classic US" forum, and so on.
Congrats on you great find!
Brian