Hi Danielle,
Nice to see you here;) I am quite new as well to printing. I am using Stampa in Brighton. Opposite The Dome. I think they are brilliant in there. Very friendly and accessible. If they do a mistake, they are very quick to rectify and if you have a deadline, they make sure to deliver in time. I am printing both my Giclee and cards with them. I was experimenting a lot with different papers in the beginning...it did cost me a bit....but you can order a sample pack from this place -
https://www.on-linepaper.co.uk - I am sure you can find cheaper on Amazon as well, but this company has given me good customer service so am sticking with them.
I am using Hannemuhle white 305gms to print at home and Stampa using the same for their Giclee....so in that way, the papers match if I get a mixed order....I usually print all my A3 at Stampa and all A4 with loads of colour, as it eats up so much in my printer and works out quite economic to do it that way. It all depends of course what you will charge for your prints.
I hope this was a little bit of help! I know I struggled in the beginning and it costed me quite a lot of money to test print and learning the printer....but now I have kind of found a happy medium of printing at home and using Stampa.
Cheers, Lena