If you want to invest in the stock market - great - since 1918 it has beat gilts and deposits bigtime. can you wait that long?, ok perhaps not so long but patience is needed.
five-ten years for stock market, and go for pooled funds that have good track records. Penny shares are a joke, if they are worth that , well they suck!
Go for a good Investment Trust, theydo make money over the long term, also better use an ISA to keep it tax free.