How to invest and when advice please

Hi everyone can someone please advise me if I have some money to invest would it be best to keep it for a few years and if so where could I put it to help it grow or would you advise to invest right now with the current economy going ok. Forgive me I have just arrived from Canada so am still not sure on how things work here but I just don't want to sit on my money and let it go stale. Thank you, Louise xx