let's see if i can find the questions correctly beneath all that:

i. research is vast. it can be anything in a particular field. so for me to "guess" what are the niche areas people are looking for, i dont even know where to begin. let alone recommending one. the best way is to find a professor in the related field and ask him/her.

ii. if u want to be a lecturer, u should familiarize urself with ur strengths and weaknesses. u might say that u can do anything people assign u to do, but remember, u will live with the specialization for the rest of ur life. people will seek u to figure out what they need in the future, as u WILL BE the expert people rely on, whether u like it or not. so dont ask what people need, or else they will suggest a course that nobody wants to do in the first place.

iii. and u should choose ur own IPTA. pick one and find out if they offer the course u wish to teach in.

iv. it doesnt really matter between masters or research, although if u're going for PhD, people prefer masters by research because u've gone through the hard work of doing research.
nope. if IPTA, u need to have at least a PhD to become a lecturer. or 10-15 years experience, if u dont have PhD.
research assistant has nothing to do with getting ur masters. but u can do ur masters while being a research assistant and use ur research job as a basis. i cant imagine how u would say the lecturer would get a masters by doing so.

yes, 3.00 should be good enough.

The lecturer is a master holder already la, so the assistant is the one doing the master study.

opss...already answered by Az above.