New member seeking advice

Hi my name is Susan Garner I have just joined today so would like to say Hi.
I work with acylic and am an abstract artist my painting are in two mediums canvas and MDF
All my canvas pieces come in various sizes I like working and are more comfortable on big canvases
My paintings on canvas are finished in an artist clear gloss varnish. The MDF pieces are finished in a clear resin which is then fired to get rid of bubbles The finish is mirrored and really brings out the colours. I have just launched a new website on etsy excited but nervous I am also hoping to exhibit soon at an art fayre so any advice such as costs and what I would need and what is supplied from a nervous newby thanks all advice welcome