Hi Ciara!
I'm a Sagittarius Sun as well with my moon between Gemini and Cancer, Gemini Ascendant.
I'm a beginner at reading astrology charts but have learnt so much since joining this site. Also thinking about becoming a psychologist when I leave school (in my second last year
)
I'm not very good at astrology but I'll have a go at your chart, (most of this stuff you'll know already)
Sag Sun: you are philosophical and freedom loving, honest, frank, jovial and good-humoured, and when paired with a Taurus Moon this can make you a bit warmer and genial; being a romantic idealist who has a lot of faith in people and aspires to make a comfortable living.
haha, having mars conjunct asc in a fire sun means that you are not one to back down from a fight, I wouldn't mess with you with all that energy!
Also your sun in first house gives you confidence, and with you, what you see is usually what you get, since planets in the first house are expressed freely in our natures, and pushed forward into the 'spotlight'. You are a true Sagittarius.
If you are interested in decans, (not everyone includes them) your sun falls into the third decan of Sagittarius which is ruled by the Sun:
http://www.alizons-psychic-secrets.com/sagittarius.html
Your ascendant falls into the second decan which is ruled by Mars:
http://www.elbertwade.com/page106.html
I'm very new to this but hope you enjoyed my interpretation anyway.
By looking at other people's charts I'm slowly beginning to understand my own more.