Hi Beamer D'cruz.
Welcome to the club. 318i 1997 would be the E36 model, which is the same model that I am driving now. Basically, the market value is around RM46k to RM48k and can even fetch higher value (depending on the condition and how u appreciate the car).
Maintenance cost should be reasonable, as this is a 4-potter and with no Vanos. However, do not expect to have a very powerful car, if you are looking for a car which carries you from point A to point B with decent comfort and driving pleasure then it should fit your criteria. If you are looking for power, try to search for the E36 328... you will love the torquey ride.
There are many BMW specialists out there in the market, u may want to search the info in this forum for more information. Let us know where you prefer the workshop to be at, maybe some of us here can assist.
Getting a 10-year old car is not an easy job. Try to search around and ask for a test drive. This will let you have a feel on the car and to know the condition. Better still, bring it to a BMW specialist to have the engine, gearbox and chassis checked (preferably with the Modic). Do expect some wear and tear parts that need to be changed. Well, too little space here to type all the lengthy points... hope you can read thru the 3-series threads to gather more info.
By the way, E36 318i is not a thirsty drinker... currently RM80 gives me around 450km (mixed driving + traffic jam) and if you are not a heavy right footed driver, then u may even get very good fuel consumption when cruising on highway (with the help of the fuel consumption gauge)... u do the math.
Cheers