I'm from the UK so would that be a problem?
and take for example..
Charizard 1st Edition Base Card...
How much profit would I make taking into account I pay the charges to get it graded etc?
I don't know the price an ungraded would go for so I can't give you much of an example lol
I would strongly suggest that you research these prices for yourself. People on here will post what
they pay to get cards graded, but that may not be what
you would pay. Living in the UK will mean that shipping will cost much more for you, as you need to send over-seas. Last time I checked, PSA only accepts boxed items (insured only?), and shipping for me was around $20-$30. Living in the UK, it will probably cost you upwards of $40, so keep that in mind when thinking of making a profit.
As for knowing which cards to grade, here is a good rule of thumb. If the card does not sell for more than $10 by itself ungraded, is it probably not worth grading in the first place. Grading will cost anywhere from $5-$15 per card (depending on which discounts you can get), so graded lower valued cards is generally a bad idea.
There is profit to be make grading, but you need to have a good amount of cash up front to even start. After that, you need to sell it; and sometimes graded cards will take awhile to sell (unless the card you graded was in high demand). Again, I strongly advise you to research this route yourself, as being more knowledgeable will def help in the long run.