Need advice on a ford focus.

[Carmanicpanda]

Greetings one and all, I am fairly new to this website so i just thought id say hi, and also I am looking for advice on cars.
Just a heads up I am Dyslexic so if any words are not spelled right then i do apologize.

OK now onto the cars.

I am getting a ford focus 205-2011 model, that i am set on, and i know its most likely going to be a 1.8 petrol. but my i only have a few questions about that and was hoping to get some answers on here.
OK so the questions are:

What Modifications are available and what do they do? and are they worth it?

Can anybody tell me any issues they have had with modifying there focus?

what are the essentials when modifying a car? where are the best places to go? (I.E big chain companies or little one off places)

What sort of performance can I expect to get out of either a 1.6 or 1.8 petrol focus with the modifications?

what body kits are out there for a 5 door focus?

sorry if some of these questions are weird I Have very little mechanical knowledge what so ever.

thanks for reading and hope you have a good weekend.

[Carmanicpanda]

thank you all so much for your replies. i am looking at the 2.0 focus and possibly thinking aabout one, which would be better a 2.0 tdci (what does that stand for anyway?) or a petrol?