well...im kinda ''new'' to this thing and my sis told me that l am getting fat....well...i wanna have muscles and strong looking abs.....any tips? im just 16 by the way and l only have dumbbells as my only equipment...any tips?

First, u have to watch ur diet, because no matter how much u work on those abs & biceps & how much muscle u have, they wo not show if ur fat is covering them.

Do reps & lots of them, but mix it up. There is something called the ''Postman Syndrome''. If u do the same rep over & over, ur body gets used to the movement & u wo not gain as much.

Also, workout ur entire body, like ur chest, shoulders, back as well. You can do all that with just dumbells. Look it up on google.

Good luck.

Just do pushups. they work on your back, upper body, and abs.. then, you can always do super crunches from below 180 degrees up (i do them with my feet under the couch back-bottom on the edge of the couch head down to the floor and crunch up elbows to knees--but l do not do a lot of them) Aside from some aerobics (running or stairs) that should pretty much do it.

The easiest answer that l can give u is to do push ups (and curls & other dumbbell exercises) along with crunches (mini-sit-ups)
With push ups vary the distance of ur hands to work different muscle groups. (For biceps it is about shoulder width apart.)
With crunches (sit-ups), keep ur back & neck as strait as u can & keep ur legs together & do not force yourself to go up all the way.

If u do lots of these u will get the results u want. That l can guarentee. Although it WILL take about 2-3 weeks before u see results. This is because u r first building the muscle under ur skin & making it stronger. Then u need to build it up.
Also, since u r probably wanting to physically see the ''6 pack'' (really, it is more of a 4 pack if ur 16) then l would advise doing walking, jogging, or swimming, some form of cardiovascular work out. this is because people have a layer of fat under their skin to help insulate heat. The running/swimming for 20-30 minutes a day will help to burn away any excess.
Oh, & this is most important, BE SURE TO KEEP EATING! l can not stress this enough. If you're building muscle the building blocks for the muscle need to come from somewhere. Carbs for energy, protein for muscle, etc.
Hope this helped!