Salut aAdel !

Proper nouns are capitalized

Je veux tuoudrais que toi et tona famille pour venirez à mon anniversaire, donc : on va faire le gâteau et, les croissants et autre chose, a. Apporte avec tu loi une balle et des l'eau .

vouloir QUE quelqu'un FASSE quelque chose (subordinate clause introduced by "que" and subjunctive)
Also, "je veux" is very imperative, it looks like you're giving an order. Soft requests involve the conditional mood => je voudrais

Pronouns with "et" are emphatic pronouns, same thing after a preposition such as "avec" => TOI et ta famille, avec TOI
"donc" isn't necessary here, there's no cause-consequence relationship

I'd pluralize "croissant" since just one for a whole group is really not much!

Sentences expressing very different ideas are separated with a dot (or at least a semicolon)

If it's a ball to play football or volley ball, it's "balle"; if it's something else, the translation may vary. Also, apporte "LA balle" would suggest Adel (or Adel and you) have only one (thus making it definite)

Indefinite quantity of something uncountable = de [+ article] => DE L'eau, DU sable, DU vin, DU jus...
"eaux" in the plural with a definite article is only used in some literary and religious contexts

Après lea fête, on va alle àr au parc pour jouer avec ldes amis .

"fête" is feminine
AU [à+le] parc
with friends (with some, indefinite friends) => avec DES amis
No space before a period, one space after it

Ne 'oubliaite pas pourde le rappel toner à ta famille.

Imparative => n'oubliE pas ("oubliais" is the imparfait of the indicative)
oublier DE faire quelque chose; rappeler quelque chose À quelqu'un
"famille" is feminine