I would like to start temping. How do I go about doing it? Oral or vaginal? When should I start? I know to do it in the mornings before getting out of bed.
fertilityfriend.com has great info about many things charting related, they have an online charting course and FAQ section that is useful. I personally chart orally, like someone said usually its the girls who get very erratic temps who go vaginal.. but that's of course after trying orally.. When to start depends.. if you want to get the hang of it, you could start now. Ideally you'd start at the beginning of a new cycle (after af leaves, though, because temps tend to be high during your period). BUT there's no harm starting mid cycle, you could get used to temping first thing and possibly get an idea of *your* temp range. And yes, not only before you get out of bed, but before you talk, sit up, ANYTHING! Do not, for example, have the thermometer on dh's side of the bed and have to climb over him to reach it. Keep it directly beside you, reach your arm over with as little movement as possible and shove it in your mouth!

The general rules are same time every day (Set alarm and go back to sleep if you have to) and after a minimum of 3 hours sleep.
I would also like to start using ovulation predictor kit/tests. When would I start using one? When would I stop? Where is the best place to get them from?
PP is right, it depends how long your cycles are. I generally don't start using them until at least cd 10 (often not til cd14ish!) because i ovulate late, but it depends on the woman. I buy mine off a woman on ebay who lives in my city. Lots of women like the ones from earlypregnancytests.com You would stop using them AFTER you get positive ones and they go from pos to neg.
What other things should I start doing or trying?
Learn about cervical fluid and how to interpret it. It plays a big role in monitering fertile/non fertile times.
I have also read about pre-seed. Is it worth using? Its quite expensive so I would like to know if its really worth using
Never used it personally, but some women SWEAR by it! Honestly i know for me that drinking 2 cups of green tea a day really increases my cm, which is *sort of* the idea of pre-seed.. to provide a lubricative environment for the spermies to live in.

So if you're not willing to spring for preseed, maybe try green tea first?