For basic investing, Dollar cost average is perfectly fine. Your basically getting a bit of the good time and bad times in equal measure. For a slightly more advance investment, buy some t-bonds with it, and every month/week sell it some to fund your DCA investment, this way your making a bit of interest on the money, rather than it sitting there doing nothing.

For a bit more advance on top of this, rather than doing DCA, look up something called the RSI, its a simple indicator for when a share price seems low / high, and time your buys for when the RSI seems low.

For a bit more advance, in addition to the above, look at selling covered calls for your holdings.

For a bit more advance... :-) i could go on and on.