Excersise Idea

So my idea was originally, just running. At first i noticed the scales droping rapidly, but no real change in body appearance. So now i figure ill add gym work (wieghts), but i was told ill see no results from that unless i have enough protien so i also bought protien powder. ive been doing that twice a week +running for about 4 weeks(purely running ive been at for about 3-4 months). no change in scales, or appearance, but i feel good about it, and i think if i increase how much im doing by just a little bit i might notice some changes.

so with that in mind, what i do currently:

Monday-gym
Tuesday-10k ave speed run
Wednesday-nothing
Thursday-10k ave speed run
Friday-gym
Saturday-aim for 10k run, not normally achieved (due to hangover)
Sunday-nothing.

Yesterday i joined my flatmates in their morning run - 4k. then i went to the pool for a little swim, aiming for 1/2hr but only managed like 15min before i didnt feel like continuing (bathers kept falling down)

i remember when i was swimming 3 times a week, a friend from highschool was saying i looked more toned then i used to. so i think i want to include swimming. but aiming for the 2k each time i used to do, takes too long, 1 hr, so i figure just push myself for 1/2hr and see if i can manage more laps in the same time. and it soothed my sore legs after the run with my flatmates (if i go running for more than like 1k 2 days in a row, my legs get sore)

so then i figure what i should aim for is:

Monday-4k run with flatmates, 1/2 hr swim (am), gym(pm)
Tuesday-10k ave speed run(pm)
Wednesday-4k run with flatmates, 1/2 hr swim (am),
Thursday-10k ave speed run(pm)
Friday-4k run with flatmates, 1/2 hr swim (am), gym(pm)
Saturday-10k run
Sunday-nothing.

if i can manage that for two/three weeks, i think ill get used to it. but i also want to build core muscles (abs, obliques, gluts) since i sit down most of the day and these muscles are important to prevent back problems, but the gym only promotes growth, not necissarily good form or balance, so someone suggested pilates. so i figure ill do that this sat morn and see if i like it. also my flatmates play squash on wednesday nights so i figure i might join in with them. But if i try all this at once ill just give up i think, so need to build up to it over next month or so.