I don't know what form its in, but what form is best? (Pill etc.)
There isn't really a difference (just personal preference). It can be in liquid (and dropped onto something), on blotter, or microtabs.
As to tips (it's all preference):
Be somewhere comfortable
* Some people want a trip sitter, some do not that's up to you (do what makes you feel comfortable, not what someone else says to do IMHO). If you would feel more safe with someone, make it someone you trust and if possible, someone experienced with tripping. If you would rather be by yourself (I prefer this, I get to see my reaction to the substance first) then just stay somewhere safe and comfy.
Keep weed (and if you smoke cigs) on hand
* I find these to be comfort items, plus everything is better when you're tripping, and everything is better when you're high.. so it's like amplified betterness

. If you smoke joints/blunts, you may prefer to roll some before hand (just in case your coordination decides to shit on you whilst tripping).
Avoid stressful situations
* For the most part avoid anyone who could make your trip suck (parents, police, annoying people). I think most people would recommend staying out of crowded areas (as this can be disorienting to some).
Mood
* For a first timer, you should probably wait on tripping if you are stressed/depressed/pissed/etc. as these emotions could interfere with your trip being "good" (unless you're aiming to get into your head, but that is another story entirely).
I'll add more as I think of them.