Customizing Dilemma

the real reason why i transferred on to this host site is because i wanted the freedom to design and customize my page. i wanted to put my own touch to it... i have that artistic calling wanting to explode. but now that im actually on it, i don't know where to start. the new beginning scared the ideas out of me, and im starting to feel frustrated.

i wanna know how i'd be able to tinker in this css formats and templates and stuffs like that. i know there's an easier way. could somebody please instruct me on this???

i'd need all the possible lay-man techniques that i could possibly get. i don't need to change much. just some kinda simple idea to get me starting would be highly appreciated! thanks guys! looking forward your replies!