for mutual funds it's almost like you investing in separate stocks and possibly selling some of them. some of its dividends can be qualified, some can be non-qualified, some can be return of capital and some can be long-term capital gains. (there are no short-term gains. they are classified as non qualified dividends)
since we don't know your other income or the breakdown of the dividend distributions, there is no way to say what taxes you'll pay.
if you invested directly in a mutual fund, after year end it will send you a 1099 breaking down the dividends
if you invested through a broker, the mutual fund will send the info to the broker to be included on the brokers 1099
other than the oddity on short-term gains, the another unusual about mutual funds, is that if it has a net capital loss for the year, it can not be distributed. in the future these losses will be used to offset capital gains the fund realizes. another thing is that the fund may pay a dividend after year-end that is for the previous year and is taxable in the previous year
