Yeah I'd grab a handful and maybe do a quarter of the pf or something. You will probably love the results (incandescents are just so hot and give off a dingy/yellowed light after a short while), but it's good to figure out whether you want to do partial incandescents or a full conversion as well as what bulb types suit your tastes.
There are full tutorials out there, but based on the Ablaze (Pb Life) line my selections are typically like so:
flat top single LEDs - pf inserts, coin door, above pf sockets that are obscured or not bright enough with frosteds (use the appropriate color)
flat top frosted single LED - exposed lighting, condomed bulbs, pf plastic illumination (typically use white unless a certain effect is desired, or use appropraite color if replacing a condomed bulb)
concave single LED - y'know I haven't found much use for these yet, but they are for spots where the socket is horizontal to or angled at the object you want illuminated... think I used a few for flipper illumination and inserts which had lamp sockets at a 45-degree angle.
3-LED bulbs - large pf inserts, inserts towards end of pf that don't stand out well, and other pf inserts you want to stand out a little more (use appropriate color)
Flashers, any type - obvious (use appropriate color, or probably just white for backbox use)
And then there is the backbox - which would probably be best done with flat top singles, but don't have an opinion on that yet - and the instructions cards - probably frosted singles?
I love doing little customizations to make things really pop, too. That is why I tend to avoid the kits.