1993 Vauxhall Corsa oil

1993 Vauxhall Corsa Manual 106000 miles

I have an L reg corsa 1.4 iv only had it a few days but iv noticed im leakin oil I put oil in there this morning went out not too far come back and the oil was near enough all gone I cant see where the leak is coming from I havnt got money for awhile and wondered if u no how much a garage would charge me to have a look at it and if I keeep topping up the oil can I still drive it in the mean time