Oil leaks are not always something to be fixed - mine has a good old weep from the rocker gasket but since it's not losing enough to worry about i won't bother fixing it.
Coolant - get a fine tipped marker and make line on the coolant bottle where the water is when cold, do the same when hot and keep an eye on the level. If it starts to drop noticeably below the lower mark then you have a leak worth worrying about. Also check that you have enough coolant in the first place, you can see the marks on the tank that tell you where the levels should be.
Problem with leaking from the radiator and pipes at the front is that when you park on a level or pointing nose down a slope, the water collects in the lower front edge of the bumper and may not show as a leak. Have a look directly under the bumper at the big rubber pipes and see if there are drips / damp patches around them. If there are, poke a finger in the liquid, sniff / taste it - if it's a sweet but sickly smell / taste then you have a coolant leak.
If you really can't get under it to see, then use a makeup mirror and the flash on your mobile to make it easier to see around corners. If no mirror, then record a video on the phone whilst you move the phone around underneath the front of the car.
If it hasn't had the following then maybe it's time to think about getting them done.
1. Oil and oil filter change.
2. Coolant flush and change and maybe a water pump at the same time.
3. Exhaust repair.
Nearly always cheaper to get one good garage to quote for the lot. Ask about the
http://www.goodgaragescheme.com - less chance of being ripped off if you go buy reccomendation.