seat covers and keyless entry systems. 1st gen

Howdy folks, A newbie here. This is the best site on the net. Just got myself 01 taco xtra cab prerunner V6 (not TRD but will be at some stage)and going to go all out on mods for it. I have a few Questions that I have not found clear cut answers to. :

keyless entry: Pretty sure i don't have it. what should I get if I wanted remote entry,remote start, and alarm. Can I get that all in one package.Are these systems tough to install.

Seat Covers. Is wet oakle the best or am I overlooking some other product. I am looking for the water proofish/ leathery kind and preferably with A taco or TRD logo.

Did i do a big bubu by puting in a K&N filter

Lastly , dont want come across as brain dead , but whats OEM mean Thanks in advance to all.

 

1st- go to street keys and search for a remote for your truck and it will tell you how to tell if you have the setup for a remote

2nd- if you are looking for something water proofish wet oakle i think you can get stuff written on the covers

oem = from the factory i think